Flutter setState() doesn't refresh my cart

So, I have a problem when remove icon is pressed. RemoveProduct is called and succesfully remove my product form list, but the setState function doesn’t refresh entyre widget as I want, and product still on the screen even it’s removed by the cartList.
The cart class contains two methods for adding and removing a product from the cart list, respectively. The AddProduct method adds the product to the list and calls notifyListeners to notify its listeners that the cart has been updated. Similarly, the RemoveProduct method removes the product from the list and calls notifyListeners to notify its listeners that the cart has been updated.

The cartPage class is a StatefulWidget that displays the cart contents. It takes an instance of the cart class as a parameter and uses it to build a ListView.builder that displays the contents of the cart

Here is the code:

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'product.dart';
import 'theme_data.dart';

class cart extends ChangeNotifier{
  List<Product> cartList=[];

  cart();

  void AddProduct(Product product)
  {
    cartList.add(product);
    notifyListeners();
  }
  void RemoveProduct(Product product)
  {
    cartList.remove(product);
    notifyListeners();
  }
}

class cartPage extends StatefulWidget {
  cart myCart;
  @override
  cartPage({required this.myCart,});

  State<cartPage> createState() => _cartPageState();
}

class _cartPageState extends State<cartPage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Cos"),
        ),
        body: SingleChildScrollView(
            child:
            Container(
              height: MediaQuery.of(context).size.height,
              child: ListView.builder(
                itemCount: widget.myCart.cartList.length,
                itemBuilder: (BuildContext context, int index) {
                  final product = widget.myCart.cartList[index];
                    return cartWidget(product: widget.myCart.cartList[index], productCart: widget.myCart,);
                },
              ),
            ),
        ),
      );

  }
}

class cartWidget extends StatefulWidget {
  Product product;
  cart productCart;
  cartWidget({
    Key? key,
    required this.product,
    required this.productCart
  }) : super(key: key);

  @override
  State<cartWidget> createState() => _cartWidgetState();
}

class _cartWidgetState extends State<cartWidget> {
  var qty = ['1', '2', '3', '4'];
  late String _selectedValue=qty[0];

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(10, 0, 10, 0),
      child: Container(
        margin: const EdgeInsets.fromLTRB(0, 15, 0, 0),
        padding: const EdgeInsets.fromLTRB(10, 5, 5, 5),
        decoration: BoxDecoration(
            color: Theme.of(context).scaffoldBackgroundColor,
            borderRadius: BorderRadius.circular(10),
            boxShadow: const [
              BoxShadow(
                spreadRadius: 1,
                blurRadius: 5,
                offset: Offset(0, 1), // changes position of shadow
              ),
            ]),
        child: Column(
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Expanded(
                  flex: 6,
                  child: Text(
                    widget.product.name,
                    style: TextStyle(
                      color: MyTheme.textColor(context),
                    ),
                  ),
                ),
                Expanded(
                    flex: 1,
                    child:  DropdownButton(
                      value: _selectedValue,
                      items: qty.map(
                              (e){
                            return DropdownMenuItem(value: e, child: Text(e, style: TextStyle(color: MyTheme.textColor(context)),),);
                          }
                      ).toList(),
                      onChanged: (val){
                        setState(() {
                          _selectedValue = val as String;

                        });
                      },
                    )
                ),
                Expanded(
                    flex: 1,
                    child: IconButton(
                        onPressed: () {
                          widget.productCart.RemoveProduct(widget.product);
                          setState(() {});
                        },
                        icon: Icon(
                          Icons.remove_circle_rounded,
                          color: MyTheme.buttonColor(context),
                        ))),
              ],
            ),
            Row(children: [
              Text(
                '${widget.product.price} lei',
                style: TextStyle(
                  color: MyTheme.buttonColor(context),
                ),
              ),
            ]),
          ],
        ),
      ),
    );
  }
}
}