Why won't my sim in college go to cl? (the sims2)?

Whenever it's time for my sim to go to cl, he goes just in time. A second later, he reappears! EVERYTIME I tell him to go to cl, he just reappears back at the lot! My other sims don't do it, just him. He goes to cl like an hour before, so I have no idea what's going on... Please Help!