Ivory tower wizards bugged?

noticed while killing ivory tower wizards in the normal difficulty instance they dont give any experience. was like 4 of them in the instance and did not recieve exp from any of them, not sure if this is supposed to be that way or if its a bug. all the other mobs gave exp. the wizards did give drops and sxp.

I’ll look into this, they should be the same amount of xp