Problem with Price in shopping Card

I have been using wp ecommerce plugin. When I click “Add to Cart” in the products page the product will be added to the cart but the price remains $0. I don’t know why this happen. But it work perfectly when I click add to cart from the Products Special Widget.
Any one have any idea of why this happen. I am using WP e-Commerce 3.5.1 version.
You can test the cart at https://www.actsinfobpo.com/ayurotics/

https://www.ads-software.com/extend/plugins/wp-e-commerce/