Hello again, about my bug again, I discovered that the double messages were only there on the lobby server, I tested to copy every plugins & configs on a test server, and this test server didn't had the double messages! Also, I noticed that after joining back the lobby after leaving it for another server made the bug disappear. But after disconnecting/reconnecting, it's there again. So to resume it, the bug seems to be there only when a player just connect & there's other player present, only on the lobby server. When switching server and switching back the problem disappear, and after a disconnect/connect, it's there again.