Sometimes, after a WF queued as a group, you're bugged and considered still in bg for the group party, and need to be kicked from group and disconnect, in order to be able to regroup. And even more, someone in the WF is not leaving, you can't regroup, because you're still considered in the WF (you see a raid window with people in the WF afk remaining or perhaps also bugged).

This bug begins to be really annoying.