When I was in the raid finder yesterday, there was a bug that did not allow players to leave the raid. I managed to get out of there by teleport. But now I can not take loot and join other raids because the game thinks that I’m still in the raid. I’ve already sent a couple of emails through bugreport but the problem has not been fixed.
I created with my friend the raid group and after leaving this group the consequences of the bug disappeared. Perhaps this information will help someone. Thank you Rooibos for suggesting a solution to this problem.