Scrolling through tiktok when suddenly “this account doesn’t exist” pops up on my screen & I get logged out.

I have no idea what happened, the video I was watching just stopped and it gave me that message & logged me out out of nowhere?? I had no issue logging back in, I went to my settings to do a security check and it said nothing suspicious was detected. There weren’t any logins from weird or random devices, only my phone. The only weird thing is that my most recent login (which was after being logged out) says “unknown login method”. Oh also right after I logged back in the first tiktok that came on was a picture of a girl’s eye and the caption said “Ik you just switched to your secret account” which was WEIRD, this is my only account and it’s not secret, but it was just so weird after everything else, it felt like a prank or something idk that was probably just a very weird coincidence, but has the random logging out every happened to anyone? What was that??