account made in May 2020 and still not movment in my lists 💔💔

It's more about when you actually added to your lists. Wait a bit longer and see what happens, it might be that some are added later on!

Made in 2018 and all my list gone, only 51 manga over +2000 saved

The fact some have returned is a good sign. Again, please be aware it's not all about when you made your account, but when you added to your lists.