Normally, some accounts that Facebook suspects are bots will change your password. and if the email or phone number is suspicious they will also delete it
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.
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