I click wait list, somone invites me then then immediatly i get removed from the group. Its not the leader doing this. happens with almost every  group i join. I have 1.8.3b and it happend with the last patch too. I dont konw what do to. Is there something somewhere that i need to check?

Are you running any addons which auto accept group / friend invites? Exampled would be dbm raid module, elvui, tukui etc. If you are running one of these addons whch auto accept group invites / friend invites, when you are invited to a oQueue group oQueue and the other addon will conflict becuase they both try to auto accept the invite.

If so, disable those addons, or disable the auto accept functionality. 

Thank you!