My Account goes back to level 1

First of all DONT EVER PROVIDE your username to anyone. Edit your post.

Dont worry, you probably accidentally logged in an empty smurf with similar username. Can you remember all your credentials?

https://boards.euw.leagueoflegends.com/en/c/help-support-en/XbalfWLe-the-region-selector-will-be-removed-from-the-login-screen-starting-next-week https://support-leagueoflegends.riotgames.com/hc/en-us/articles/360043328413-Regionless-Accounts-League-of-Legends

Before login in, click bottom right corner cog, I see "current patchline" and I can choose Live EUW or PBE.

Please help me!

Happened to me, Accidently logged into my pbe account. make sure its the right username