Player joins and all online players on said server are instantly kicked

Earlier today someone who plays my server reached out and said that they were getting randomly kicked. Console says they were disconnecting. They got a screenshot of the error and its the error caused by chunk banning. I scanned their entire base and its not chunk banned. Upon investigating I discovered that their friend who was playing with them was the cause. anytime said player joins all players connected to that specific server of the velocity server are kicked with the message. Any attempts to use openinv, or other admin plugins to determine data on the player result in the same thing. I'm working on checking player data files manually but I wanted to see if anyone else has any ideas of causes or whether its an exploit.
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