Error when add to cart a not predefined product variant

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.0
-- PHP version -- : 5.6

When i try to add to cart a variant of a product that is not the predefined, when i add to cart, Hikashop doesn't add the variant i've selected, but It Adds the predefined variant!

I try switch the default template, but it isn't.

Can you help me?

Hello,

Can you provide an screenshot of your variant configuration IN your product configuration page ?
More precisely, I'm waiting something like this :



Note : several screenshots, for each variant or at least 2 or 3, can be more efficient.
Maybe this screenshot can already help you, if not we are awaiting news from you.

Regards

Thank you,
we solve the problem modifing product / show_default file according this topic:

www.hikashop.com/forum/4-how-to/77636-pr...ics-add-in-cart.html

I post it for other with some problem.