When someone new joins the group, sometimes it will not let them join us, saying instance full. The group members are saying this is a bug. But every time I have experienced this, it's only when someone is qued as multiple roles. The tool thinks we have 3 dps, or 2 tanks, etc and won't let the new member join. When everyone is only qued as one role I never have this issue. They need to restrict us from queing as multiple roles.
I've had it happen twice today. The previous member had already left the dungeon