its happening with everyone, for the time being just add it in "Add to list" things temporarily, also they aren't deleted you'll get them back.
don't worry, ppl whose acc were made in 2014 and 2015, as in earlier years, slowly got their reads back.
Currently users who added stuff before January 2024 in their acc are getting their reads back. It wont all come back instantly but slowly one by one.
Here's proof of accs who've gotten their lists back :
https://www.mangago.me/home/people/65330/home/
https://www.mangago.me/home/people/7934/home/
https://www.mangago.me/home/people/12004/home/
so yeahh it'll take quite some time but you'll get them back.
also once they're back, in case you're looking for ways to save them perhaps in an excel file, I've made a tutorial on how to do it easily and quickly rather than having to enter everything manually one by one, so if you'd like, you can check it out.
https://docs.google.com/document/d/14Drj0CviUhrAmZlU-DC-AtxGFQoH1_PYQ81b2Vzu82w/edit?tab=t.0
also check out this faq
https://www.mangago.me/home/mangatopic/21080691/
and this to keep up with the time stamp
https://www.mangago.me/home/mangatopic/21092806/

help why can i add new manhwa to read noww huwaaaa!!!! not to mention my old readings all gone