duplicate people in the same server

Me and my friend handleineed where placing a large amount of tnt in a big crater. Handleineed was in the center when it exploded it kicked him from the server. When he got back on the server there was a duplicate of him. I left the server and looked who was on the server and saw handleineed two times on the player list. When I got back on the server his duplicate left after 4 or 5 minuets. This glitch also happened to me 15 minuets later.

Picture of the player list
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When the glitch happened to me
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handleineeds duplicate
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