I joined a dungeon party, which filled to 5. When we went into the dungeon, it looked like 2 people were instantly kicked out, one of which rejoined, and who then told us that they were placed in a different party/instance somehow. Then another person joined and the same thing happens to me: I get kicked out of the instance/party, only to be automatically placed in another party (doing the same dungeon), along with the last person who joined the previous group. I don’t know if the same thing happened to him, or if the game somehow placed him in 2 groups simultaneously and that caused the weird stuff to happen.