When I logged out of PixarPlanet on another computer, my name still read!!! Is it possible someone’s trying to hack me!!!
Possibly a glitch, JSWeC. Could you take a screenshot of you logged out and the imposter’s username on-screen next time this happens? 
Ok, I’ll do that.
The Who’s Online represents any users that have done anything in the past 15-30 minutes or so, even if you log out, so it was probably just you.