Cart problems in a custom design

[Eikc]

Hey everyone,

 

I'm having a bit of a problem which puzzles me alot.

 

i have a test shop at http://kcb-group.com/presta/en/ running my custom theme and canin.sk's OPC module.

 

Everything works fine, you can add a product and go to the checkout, see the cart summary.. use plus and minus to change the quantity and so forth.

 

the problem comes here.. if you deside to go back and add another product to the cart and go back to the summary. Then the quantity and price wont update when you use plus / minus but the rest is updating (total price, shipping cost and so on).

 

if you press on the cart button, to get the dropdown, i can see the newly added product twice in the cart module.

 

if you refresh your browser, it works as expected.

 

 

Anyone has a clue whats going on?