ADD to cart not working

Hi , 

Woocommerce 2.6 + Latest version of FPD   + StoreFront 

After customization the Add to Cart Button does nothing ... 

Any help please ? 

This is the page where you can see the problem . 

http://www.fotodigitalquartu.com/prodotto/sample-product/tazza-personalizzata/

Thank You , 

Franco