Hey, this happend before. It seems the gaijin and steam relationship doesn’t work as it should. When I try to log in with my usual credential, for some reason it created a new profile from scratch and probably deleted (i hope not) my old profile with all the progress. I might never play this game again after this, its the second time and no apparent reason/explanation
Playing on the newly created profile could potentially overwrite or complicate the process of retrieving your old account.