CheckBox setChecked(true) simply isn't working

I have a checkbox, defined as such in XML:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#FFF"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/item1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#FFF">

        <CheckBox
            android:id="@+id/checkbox_monitor"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:text="Monitor (present and restocked)"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="6dp"
            android:layout_marginLeft="16dp"
            android:layout_marginBottom="6dp"/>
    </RelativeLayout>
    ...
</LinearLayout>

This LinearLayout is made up of ten similar RelativeLayouts and is embedded within a ScrollView, if that makes any difference.

Here is the corresponding Activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_eos);
    setTitle("End of Shift Check-Off");

    setToolbarColor();
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    // Checkboxes
    CheckBox cbMonitor = findViewById(R.id.checkbox_monitor);
    cbMonitor.setChecked(true);
    ....
}

Simply put, the setChecked() function does not work. Initially, I assumed my condition was not returning true, but the function on its own does not work and I have no idea why. I have been searching for hours, any help or feedback at all is greatly appreciated.