The site went down around jan 26 and unfortunately everyone's lists were wiped (not on purpose)
They were recovering it as usual as this has happened before, but the list containing disks crashed and they can only recover lists data from rated/tagged entries. I assume this is why site recovery is taking longer than usual.
I lowk wouldn't edit your lists for now and save everything from now on off-site.
https://www.mangago.me/home/mangatopic/21255174/
FAQ here. If you have any more questions, ask me I wrote it

I'm a long term member (6yrs) and I had 300+ mangas/mahuas saved. It's been a while since I logged in, but nnow my account is showing I have 7 saved. Seven. Siete.
Has any one else experienced this? Was there a server update or something? Am I cooked? ( ̄∇ ̄")