Problem select attribute

[giulia09]

Hello,

I have a problem with the selection of the attributes on the data sheet:

http://shop.paoul.com/it/dance-danze-standard/13-decollete-carne.html#/

I have various combinations of products (size / heel), when one atribute of the product change appears quickly the text "not available" and then show me a random combination (chosen by Prestashop), and always appear the same combination at every change of the select statement.

It also happens if a combination is aviable.

I used the defaut theme.

 

Anyone knows what is the problem thanks.

I'm losing a lot of time.