I'm posting here, so clearly i know my credentials.

3 days ago i gifted someone 100tc through the forum, and today when i tried to play it says login failed, please check username password, use /login username password. Enter in my information and nothing seems to happen...

Try changing your password.

Its just the normal issue try re installing your game think how you can login in forum but not ingame nobody hacked you that issue sometimes happen to me also.just wait and it will get fixed.