Players can t have diffrent imported skins

for some reason for example on the server MineVille City if two players have imported skin on them and a new player comes in, and puts on an imported skin the others whit an imported skin on gonna get that skin thats the new imported skin player did put on. But this can be used the wrong way by someone making someone else whit an imported skin get an bannable skin on them in a server they can prob get banned for it when they have really done nothing.