Shopping cart broken by Blogs MU theme

Hi

If you visit my download store here:

http://6sided.net/products-2/

And add a product, you get taken to the cart page. The cart does not function however so you cannot remove items from the cart. The cart icons are not clickable and are spread into the right hand column.

If I switch to default BP or Wp theme, the cart works.

What could be causing the theme to break the cart?