hi, thats happening to me too. just go through this! they explained almost everything.
https://www.mangago.me/home/mangatopic/21080691/
The reading list issue still hasn't been fixed. The first pass only ended yesterday, we have the second pass for other lists. It also depends on non-rated manga, and if you were missed from the first pass or not. The log out issue is also due to the issues with the site at the moment, everyone's just gonna have to hold on until it's fixed.

Yk, how usually once you log in, you stay logged in for at least like a day, lately I just get logged out. And my reading, have already read and want to read list are still not back