1-The cart doesn't update the number of items that the user has chosen, until they refresh the page. The cart always shows 0.

2-Make something so the user can choose several items without always seeing the "dialogue box of Shopping Cart - Delivery Address - Payment Method - Complete"
Let the user choose so many items, then in the end, they can proceed to checkout. It is annoying when you have to keep closing this windows every time you want to add an item to the cart.