Danhiel, many thx for your quick answer !
I managed to contact Trenitalia, (SBB sends the tickets, nevertheless Trenitalia is the final responsible, not SBB).
They confirmed that those tickets are “standard”, that all the tickets are the same.
I appreciated the confirmation but I got a bit disappointed because it is confusing for traverls. No additional reply from Trenitalia.
In my opinion, Trenitalia should change the procedure…..
Thanks one more time for your help !
Leyva