Virtuemart not adding product, no JS errors

[vieke]

SO yeah,

i've tried every topic on this forum about this issue, but my VM add to cart button simply does not add the product to the cart and i don't have anny JS errors. I'm lost.

VM: 3.0.9
J2.5.28

i'm Using Gantry 4, when i switch templates it works, so i guess its a gantry problem (Rocket won't help with that).
I've tried disabling the mediaqueries script and the browserversion script, but that does nothing.

The shop is not yet accasible true the menu's but here is a problamatic page:
http://comfortair.be/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=3&virtuemart_category_id=3

any advice will be apriciated !.

EDIT:

i just noticed that the order button does work in the categorie view, but it does not work in the product view. IEP ?