Problem with add products to cart

-- url of the page with the problem -- : www.foro.rdsinformatica.com
-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8

Hi.
I have a problem when I select a product to add, is not added to cart.

Hi,

This looks like a problem with your Joomla template caching the javascript on the pages and because of that, the javascript of HikaShop is missing and thus HikaShop can't work properly.
Turn off the caching/optimization of the javascript in your Joomla template/plugin of the Joomla template and it should help.