Forms not passing data to database but no error Laravel 5.8.22

I'm new to Laravel and I'm trying out a multiple-data insert into multiple tables according to this tutorial. I replicated the project but the data doesn't get through to the database when I insert with the forms. I can see the data when I manually insert through PhPMyAdmin, so I doubt it's a database connection problem. The values to be inserted get stuck like:

The OrderController is:

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Orders;
use App\Items;

class OrderController extends Controller
{

public function index()
{ 
    $orders=Orders::all();
    return view('front_page.view',compact('orders'));
}

public function store(Request $request)
{ 
    $data=$request->all();
    $lastid=Orders::create($data)->id;
    if(count($request->product_name) > 0)
    {
    foreach($request->product_name as $item=>$v){
        $data2=array('orders_id'=>$lastid, 'product_name'=>$request->product_name[$item], 'brand'=>$request->brand[$item], 'quantity'=>$request->quantity[$item], 'budget'=>$request->budget[$item],              'amount'=>$request->amount[$item]            );
    Items::insert($data2);
      }
        }
    return redirect()->back()->with('success','data insert successfully');
    }

    public function items($id)
    {
        $items=Items::where('orders_id','=',$id)->get();
        return view('front_page.items',compact('items'));
    }
}

The items.blade.php is:

@extends('layouts.master')
@section('title','view items')
@section('content')
<table class="table table-bordered">
    <thead>
        <tr>
            <th>SL</th>
            <th>Product Name</th>
            <th>Brand</th>
            <th>Quantity</th>
            <th>Budget</th>
            <th>Total Amount</th>
        </tr>
    </thead>
    <tbody>
    @foreach($items as $key=>$item)
        <tr>
            <td> </td>
            <td> </td>
            <td> </td>
            <td> </td>
            <td> </td>
            <td> </td>
        </tr>
    @endforeach
    </tbody>

</table>
@endsection

And the routes are:

Route::post('/orders','OrderController@store');
Route::get('/orders','OrderController@index');
Route::get('/items/{id}','OrderController@items');

What am I doing wrong? Or is it just a compatibility issue? Thanks

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