Problem in Laravel10 , only the last checked item is saved

This form contains three items. I need the customer to be able to tick the required quantity (mnozstvi) for each item. The problem is that I only ever store the single/last item for which the quantity (mnozstvi) has been ticked in the order_items table. At the same time, I need to add a function that if a person does not check anything for one of the items, that the item is saved in the table as well but with a value of 0 (not interested in this product). Three records must always be stored in the table for an order. I tried checkboxes instead of radio, but it was the same problem. Where am I wrong?

HTML form:

<form class="repeater" method="post" action="" enctype="multipart/form-data">
@csrf

<input type="hidden" name="email" value="">
<div class="mb-3 col-lg-2">
    <label for="provozovna">Objednávka pro provozovnu...</label>
    <select class="form-select" id="provozovna" name="provozovna" required>
        <option disabled selected>Vybrat...</option>
        <option value="1">Praha</option>
        <option value="2">Brno</option>
    </select>
</div>

<hr>

<div class="row">
    <div class="col-md-6">
        <h3>Verze s nikotinem</h3>
        <hr>
        <div data-repeater-list="group-a">
            <div data-repeater-item class="row">
                <div class="mb-3 col-lg-6">
                    <label for="nikotin">Název</label><br>
                    <img src="" class="avatar-xxs rounded-circle" alt="Blueberry">
                    <input type="hidden" name="barva" value="blueberry">
                    Puff House - 800 potáhnutí, Blueberry Ice
                    <input type="hidden" name="order_items[0][nazev]" value="800-blueberry">
                    <input type="hidden" name="order_items[0][nikotin]" value="s nikotinem">
                </div>

                <div class="mb-3 col-lg-4">
                    <div class="container mt-4">
                        <div class="btn-toolbar" role="toolbar">
                            <div class="btn-group" role="group">
                                <input type="radio" class="btn-check" name="order_items[0][mnozstvi]" id="btnBlueberry1" value="12" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnBlueberry1">x12</label>

                                <input type="radio" class="btn-check" name="order_items[0][mnozstvi]" id="btnBlueberry2" value="24" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnBlueberry2">x24</label>

                                <input type="radio" class="btn-check" name="order_items[0][mnozstvi]" id="btnBlueberry3" value="36" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnBlueberry3">x36</label>

                                <input type="radio" class="btn-check" name="order_items[0][mnozstvi]" id="btnBlueberry4" value="48" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnBlueberry4">x48</label>

                                <input type="radio" class="btn-check" name="order_items[0][mnozstvi]" id="btnBlueberry5" value="60" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnBlueberry5">x60</label>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <div data-repeater-item class="row">
                <div class="mb-3 col-lg-6">
                    <img src="" class="avatar-xxs rounded-circle" alt="Fruit Mix">
                    <input type="hidden" name="barva" value="fruitmix">
                    Puff House - 800 potáhnutí, Fruit Mix
                    <input type="hidden" name="order_items[1][nazev]" value="800-fruitmix">
                    <input type="hidden" name="order_items[1][nikotin]" value="s nikotinem">
                </div>

                <div class="mb-3 col-lg-4">
                    <div class="container">
                        <div class="btn-toolbar" role="toolbar">
                            <div class="btn-group" role="group">
                                <input type="radio" class="btn-check" name="order_items[1][mnozstvi]" id="btnFruitmix1" value="12" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnFruitmix1">x12</label>

                                <input type="radio" class="btn-check" name="order_items[1][mnozstvi]" id="btnFruitmix2" value="24" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnFruitmix2">x24</label>

                                <input type="radio" class="btn-check" name="order_items[1][mnozstvi]" id="btnFruitmix3" value="36" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnFruitmix3">x36</label>

                                <input type="radio" class="btn-check" name="order_items[1][mnozstvi]" id="btnFruitmix4" value="48" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnFruitmix4">x48</label>

                                <input type="radio" class="btn-check" name="order_items[1][mnozstvi]" id="btnFruitmix5" value="60" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnFruitmix5">x60</label>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

        </div>
    </div>

    <div class="col-md-6">
        <h3>Verze bez nikotinu</h3>
        <hr>
        <div data-repeater-list="group-a">
            <div data-repeater-item class="row">
                <div class="mb-3 col-lg-6">
                    <label for="nikotin">Název</label><br>
                    <img src="" class="avatar-xxs rounded-circle" alt="Lychee Ice">
                    <input type="hidden" name="barva" value="lycheeZero">
                    Puff House, Lychee Ice ZERO 800+
                    <input type="hidden" name="order_items[2][nazev]" value="800-lycheeZero">
                    <input type="hidden" name="order_items[2][nikotin]" value="bez nikotinu">
                </div>

                <div class="mb-3 col-lg-4">
                    <div class="container mt-4">
                        <div class="btn-toolbar" role="toolbar">
                            <div class="btn-group" role="group">
                                <input type="radio" class="btn-check" name="order_items[2][mnozstvi]" id="btnLycheeZero1" value="12" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnLycheeZero1">x12</label>

                                <input type="radio" class="btn-check" name="order_items[2][mnozstvi]" id="btnLycheeZero2" value="24" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnLycheeZero2">x24</label>

                                <input type="radio" class="btn-check" name="order_items[2][mnozstvi]" id="btnLycheeZero3" value="36" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnLycheeZero3">x36</label>

                                <input type="radio" class="btn-check" name="order_items[2][mnozstvi]" id="btnLycheeZero4" value="48" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnLycheeZero4">x48</label>

                                <input type="radio" class="btn-check" name="order_items[2][mnozstvi]" id="btnLycheeZero5" value="60" autocomplete="off">
                                <label class="btn btn-outline-primary" for="btnLycheeZero5">x60</label>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

</div>


<div class="d-flex justify-content-end">
    <input type="submit" class="btn btn-primary" value="Odeslat objednávku"/>
</div>

And my controller looks like this:

    <?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Order;
use App\Models\OrderItem;

class OrderController extends Controller
{
    public function processForm(Request $request)
    {
        // Zpracování formuláře a uložení do databáze

        $order = new Order();
        $order->provozovna_id = $request->input('provozovna');
        $order->email = $request->input('email');
        $order->save();

        $orderItems = $request->input('order_items');

        foreach ($orderItems as $item) {
            $orderItem = new OrderItem();
            $orderItem->order_id = $order->id;
            $orderItem->nazev = $item['nazev'];
            $orderItem->nikotin = $item['nikotin'];
            $orderItem->mnozstvi = isset($item['mnozstvi']) ? $item['mnozstvi'] : 0;

            $orderItem->save();
        }

        return redirect()->back()->with('success', 'Objednávka byla úspěšně odeslána.');
    }
}