Hi! Pls refer to the post below which explains it better than I can. But essentially, they have started re-adding and organizing everything into your list but it will take time because they're organizing it by the time it appears in the data (meaning the time you added it to your list). This means that manga you added in 2019 will be prioritized over manga you add in 2026. They will get to everything eventually, but they expect to finish the already read list in under 2 days for all accounts. After that, I think they'll work on the now reading and want to read lists. Hope this helps!
Post explaining in more detail:
https://www.mangago.me/home/mangatopic/21080691/

i know everyone’s marked mangas has disappeared for a bit, and while all my mangas that were marked on or before jan 2021 are back (like they said it would be), it’s all in my already read list and for some reason not distributed to my want to read and reading as well… will this be fixed?