it's a part of the glitch that's happening site wide. please go to the links here https://www.mangago.me/home/mangatopic/21109166/ for more information. also suggestions on what you can do while you're waiting if you want.
woah just noticed this, i clicked on a tag and all the ones listed are marked as 1969
it's funny 1969-12-30 12:00 est right? lol new years eve lol. i'm glad some of your stuff is back. some of us suggest though don't do house keeping until everything is settled (moving stuff to other lists, deleting things, and marking them as private or seen) that was if something else happens, you don't end up having to repeat the process a second time
When I go to the manga tab from my homepage it doesn't show my read/reading/want to read, but my tags are all still there!!