I have three problems:
1. When I change the quantity on a book at the home-page and click add to cart, only one item is added to the cart and not the quantity I chose.
2. And when I change the quantity in the cart (side bar or page) the price does not change.
3. And whenever I add a product to the cart the whole page loads again.
Can you please help me to fix that? Thank you so much.