Does your net provider get your location correct? Kinetic will indicate that I'm in a different town about every time I log in to a site.
That can make providers think somebody else has tried to log into your account. But they typically send a text that you can use to confirm that it is you.
This is only peripherally related to your issue admittedly.

I've been a fb user for 12 years and have never heard of a situation like yours.
FWIW, my initial reaction is that it is not a hack but something re your account that has corrupted on fb's end.

Hopefully somebody will respond that has been through a similar situation.

Bud


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