Facebook changed my infos without notice

maybe your account was hacked by someone
If anyone can break into your niche, you should create additional security verification steps to avoid being lost
I had the same situation as you, a series of profiles were logged out and when I logged back in they said the password was wrong. I had to delete my browser's cookies and then retrieve my password by email.
Your account has likely been hacked, you should check the information and reset security then delete all strange logins. Be careful, nowadays there are many hackers with bad intentions.
I thinks your account maybe hacker, you shoule be setup 2FA security
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