DTO

Hello, nobody can help me with this problem?

Hello, i have a problem, with combination selector on my Prestashop installation. Pratically if I create a product in backend directly with combination, it appear in frontend and are correctly selectionable, but, if I import a product via csv and create a combination, there is an error on frontend, practically is not possible to choose the combination, and if I try to change it will return in default one. This is also if I add a combination via csv. i add a link to the product imported for understand better the problem: https://justpet.it/it/home/94-313-optimanova-kitten-pollo-riso-8413037201708.html#/81-gusto-pollo_e_riso/86-pesosacchi-400g in particular you can see on "FORMATO" selection Someone know what is the problem?