Oh my gosh - I agree, Dee!
I have no answers, but can add a few weird details -
This started happening to me in August - on Chrome browser, where I tried every "fix" I could find, then I installed CCleaner Browser for a while, and then Edge Browser, which was working great for 4 days, but today, it lost them all, too. (Firefox hasn't
lost my passwords, but crashes my PC)
Chrome Browser - Really weird - when my passwords all disappear, I can go to a site, log in by typing the info, and save the password for that site.
Then if I go to my passwords list in Chrome, I see that one password.
BUT if I delete that password, then ALL my passwords immediately reappear! So they're saved somewhere...
CCLeaner Browser - The passwords would disappear and reappear every few hours over the day, without any consistent input from me.
Edge Browser - looks like they're just gone today, none of my tricks make them reappear so far.
I only save passwords on my PC, so I don't use sync, nor do I want to save them anywhere except in my PC AppData.
Super super frustrating.
Nancy