Why adding the switch or checkbox button in Relative layout messes up the entire layout?

I want to add a switch or checkbox button to a fragment layout. When i add it, it loads the layout until the checkbox comes, and it kinda "destroy" the layout, mixing it with the previous layout fragment.

I tried using switch and checkbox and it messes up, using another textview instead it works fine.

Here is a photo with switch in xml: Image with switch As you can see, the left margin is cutted and at his bottom there are elements from previous layout, and they are not clickable.

Here is a photo with a textview instead of the switch element: image without switch Here, the layout works perfectly.

Here is the xml layout, with a not simple structure for creating the layout i wanted. At the bottom of the layout file, you can see the switch element, which i think it ruins the entire layout.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:background="#E8E8E8"
    >

    <android.support.design.card.MaterialCardView
        android:id="@+id/acquisto_cardview_info"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardElevation="2dp"
        android:layout_margin="8dp"
        card_view:cardCornerRadius="5dp"
        card_view:strokeColor=" #696969"
        card_view:strokeWidth="1dp"
        >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp">

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_info_intestazione"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                >

                <TextView
                    android:id="@+id/acquisto_cardview_info_intestazione_text1"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="@string/info_intestazione"
                    android:background="@drawable/textview_sottolineato"
                    style="@style/italictext_summary"
                    />

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_info_tot_articoli"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_below="@id/acquisto_cardview_info_intestazione"
                >

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/acquisto_cardview_info_tot_articoli_txt_label"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/info_totale_articoli"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentStart="true"
                        android:ellipsize="end"

                        />

                    <TextView
                        android:id="@+id/acquisto_cardview_info_tot_articoli_txt_prezzo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text=""
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentEnd="true"
                        />

                </RelativeLayout>


            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_info_punti_guadagnati"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_below="@id/acquisto_cardview_info_tot_articoli"
                >

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/acquisto_cardview_info_punti_guadagnati_txt_label"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/info_punti_guagnati"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentStart="true"
                        android:ellipsize="end"

                        />

                    <TextView
                        android:id="@+id/acquisto_cardview_info_punti_guadagnati_txt_prezzo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text=""
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentEnd="true"
                        />

                </RelativeLayout>


            </android.support.v7.widget.CardView>


        </RelativeLayout>

    </android.support.design.card.MaterialCardView>

    <android.support.design.card.MaterialCardView
        android:id="@+id/acquisto_cardview_impo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardElevation="2dp"
        android:layout_margin="8dp"
        card_view:cardCornerRadius="5dp"
        card_view:strokeColor=" #696969"
        card_view:strokeWidth="1dp"
        android:layout_below="@id/acquisto_cardview_info"
        >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp">

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_impo_intestazione"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                >

                <TextView
                    android:id="@+id/acquisto_cardview_impo_intestazione_text1"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="@string/impo_intestazione"
                    android:background="@drawable/textview_sottolineato"
                    style="@style/italictext_summary"
                    />

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_impo_carta_addebitata"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_below="@id/acquisto_cardview_impo_intestazione"
                >

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/acquisto_cardview_impo_carta_addebitata_txt_label"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/impo_carta_addebitata"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentStart="true"
                        android:ellipsize="end"
                        android:layout_toStartOf="@id/acquisto_cardview_impo_carta_addebitata_txt_prezzo"

                        />

                    <TextView
                        android:id="@+id/acquisto_cardview_impo_carta_addebitata_txt_prezzo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Visa :x 5748"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentEnd="true"

                        />

                </RelativeLayout>


            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_impo_sconto_disponibile"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_below="@id/acquisto_cardview_impo_carta_addebitata"
                >

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/acquisto_cardview_impo_sconto_disponibile_txt_label"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/impo_sconto_disponibile"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentStart="true"
                        android:ellipsize="end"

                        />

                    <TextView
                        android:id="@+id/acquisto_cardview_impo_sconto_disponibile_txt_prezzo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text=""
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentEnd="true"
                        />

                </RelativeLayout>


            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:id="@+id/acquisto_cardview_impo_checkbox_sconto"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_below="@id/acquisto_cardview_impo_sconto_disponibile"
                >

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <!--inserire checkbox qui-->
                    <Switch

                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="DA RIMPIAZZARE CON SWITCH"
                        style="@style/acquisto_card_textview"
                        android:layout_alignParentStart="true"
                        android:ellipsize="end"

                        />


                </RelativeLayout>


            </android.support.v7.widget.CardView>


        </RelativeLayout>

    </android.support.design.card.MaterialCardView>




</RelativeLayout>

Please help me, i dont know what's happening here.