keychain stopped saving passwords

Hi, I've seen many posts about keychain doing strange things, but nothing like what I got.

Basically, one day out of the blue, the majority of my saved internet passwords were gone. Simply disappeared from keychain. Some were still there and they still worked, as in I got proposed the right credentials overtime I went on that specific website.

When I went on any website that had a password stored (which was gone), safari would ask if I wanted my password saved, but keychain never actually saved anything. BUT, if I entered user and password manually in keychain, it works perfectly.

I tried first aid and pretty much any other tip I found on the internet, but nothing helped.

Has anyone came across this one before?

thank you very much

Mauro