Someone is joining and kicking us out of our own Server.

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We have our Server set so anyone can join. But no one has any permissions in the starting channel. Some clan we have never even heard of called RG Revo? Is joining and kicking us out of our server and even shutting it down to have them join theirs. We get poked then a few seconds later kicked. ... Someone is joining and kicking us out of our own Server.