I was just asking... how normal is this?
It happens a lot, for financial gains. It can be caused by a weak password after the 2015-hack, phishing sites, or probably other means too.
Just delete everything, and welcome back!
What's
not normal, is that an account thief doesn't change your password! Normally, you wouldn't be able to log in anymore.
Yeah, that's very strange, has there happened such a thing? Someone did a hard work and keep password the same

Maybe you are first OP with this situation. Curious is that it happens today, when people have suicidal thoughts because of this merit and OP got it automatically.
You can edit (but why to edit someone's posts if you don't want them to be posted?) or delete as much as you wish.