Hi, currently I face a strange behaviour which I can't explain (and can't change therefore).
On http://www.esc-rollout.de/fahrertraining/08-11-februar-2013wintertraining-lappland/ you find a single product page with a main product and some "extras" in the second block of tabs. If the main product is added to the cart - fine. If then you add some extras like hotel room, the main product is added again to the cart. And if you add another extra product, cart even shows different sums in the cart in the sidebar and the one on top of the page.
Funny enough - if I start selecting by an "extra" in first place and then the main item, everthing's fine (till I add another extra).
And - if you add an extra from a different main product page, everything's fine too.
Problem only seems to occur once you add products from the same page.
There must be something in the script on the "add to cart" button in the extra products I have in the tabs which causes this. Could you please give me a hint where to dive into which .php file? Thanks in advance.