On Checkout, Total Order is not calculating and Payment method is not working.

It was working nice but don’t know how change occurred.

http://seoindianexperts.com/projects/waterking/product/

After add product to cart, view cart shows the order total but when I click on “proceed to checkout”, the checkout page is not calculating the order total and also not showing the Payment method.

Please help me to find the solution.

http://wordpress.org/plugins/woocommerce/