WotLK Imp won't attack

[nuclearunicorn7]

For some reason, my imp doesn't want to attack no matter what behavior they're set on, and even then, they won't attack if I choose to do it manually. I tried to do a clean install to fix this, but the problem stayed. I heard that Control Pet was a thing in 4.0.1, but I don't know if it's in 3.3.5a and when playing on a different private server I didn't have this problem. Creating a new toon doesn't fix the problem either.