Woocomerce – Variable products not adding to cart

Hello,

I have been having this problem with woocomerce for some days now , I created some variable products and everything worked fine , the add to cart button showed up and all but when I click it nothing happens.
On normal products I have no problems , it adds to cart without a problem.
You can see this happen in here:
https://buygift.pt/develop/produto/91008-plata/

I have the latest version of Woocomerce and WordPress installed and I don’t seem to see any javascript errors on the page. Anyone have any ideas ?

Thanks