Thank you for your answer,
thinking I did something wrong in my shop I reinstalled the demo shop with only SBA module, the problem is repeated but other errors happen I send you photos

Click image for larger version.  Name: negozio demo quantita doppie in selezione.jpg  Views: 27  Size: 75.7 KB  ID: 19003

if I duplicate an article from the catalog, they double the attributes

Click image for larger version.  Name: negozio demo duplico prodotto e si genera 2 volte gli attributi.jpg  Views: 24  Size: 40.2 KB  ID: 19004

then if I go to see in catalog -> SBA link an attribute with empty space is generated

Click image for larger version.  Name: negozio demo duplico prodotto e si genera 1 riga vuota.jpg  Views: 29  Size: 33.2 KB  ID: 19005

if I duplicate an article with multiple attributes, this is what you see in the picture

Click image for larger version.  Name: negozio demo duplico prodotto e si genera 4 righe vuote.jpg  Views: 27  Size: 53.9 KB  ID: 19006

I hope the information I send you will help you solve the problem. thanks for your help