I was jsut logged out and a message saying something like:

Can not complete action because user is not owner of the account. Should i be conserned im being hacked? I am using steam if that matters. I was able to log back in after one failed attempt and doesn't seem to any further problems but should i look into this further?

can you log back in? like straight away?

If so then i doubt it's a hack attempt, for one an attempt with the correct login details would lock the account because of the change in IP address.
For seconds either you or the would be hacker would need to enter the unlock code GGG send when a lock happens.

None of that has happened though.

ok thank you

If you have a dynamic IP address, it might be that it changed during the play session, so when you were about to logg back in, the locking security feature kicked in and saw a new IP, hence the ''user is not the owner of the account'' warning.