After Login into Microsoft Account all worlds gone

Hey,

I tried login into my microsoft account (on my Ipad with the pocket edition) and everything worked until i saw that all my world‘s are gone. I‘m absolutely sure that it’s not because of where i safed them, because i safed them on my account and I did login other times the few last years and then it worked perfectly and all my worlds were there.
I hope someone can help me because i have a lot of troubles with minecraft in the last few months and i think its sad because i really liked the game but now it starts to become frustrating. Thank you