Hey, we somehow have the same story which happened in a BTC Talk account though in my case, it was a bit different.

On one ordinary day in January 2020, I opened Bitcointalk forum in my web browser chrome. Did daily check on my account like messages, replies from a thread. You know the usual, on the lower part of my profile page there goes a negative trust.
It was from tvplus006 that said that I was posting some doubler scam in Investor-based section here.
I was like surprised because I didn't post anything like that and I never once in my life even visit that section nor post something to it.
So like the usual, I asked help in a thread and pm'ed the one that gave me negative trust as well and referred the link to the thread that I created.
It turns out someone from "Turkey" logged into my account based on the IP logs provided here in the forum.

It went well in the end. I changed my password and log out because that would end every session of anyone logged into my account in different device. I cleaned my PC with an antivirus and some basic disk cleaning software, because I was really panicking that my sensitive info might get leaked.

Scanning and cleaning one's PC for malware/virus is often overlooked by many but it is indeed crucial. I learned my lesson that day to always clean my PC and log out every session not just in my Bitcointalk Forum account.

If anyone is curious on where is the thread that I made that day. Here it is : https://bitcointalk.org/index.php?topic=5217251.msg53594867#msg53594867
It might be over a year already, but I wanted to thank everyone again in that thread for their help in my situation.

tldr; Somebody from Turkey got into my BTC Talk account, so I did every means to not ever let it happen again with the help of reputated members here in the forum.