MCBE name in realm glitch

i'm playing on my survival realm with my friend but when we're trying to make the gardien farm he left and when he join he joined with the name of my second account he said he's my frined and i told him to try to leave the realm and rejoin and when he rejoin he joined with the name of my frined's name wow please repair this glitch and that happend 5 times or + so please remove that essue