I might be wrong because I haven't done cross-platform on 50v50, but in cross-play the game shows an icon indicating the platform on which your squadmates are playing. This is an image of me playing with two of my friends, one on Xbox One with me, and another on the Switch:could be 2 things either its a glitch with lag or something. or its a pc player modding since cross platform and all.
It could be lag or it could be a glitched player model that hanged while the guy danced earlier, and he is stuck in one of the frames of the dancing animation. I'm sure he doesn't appear that way on his own screen. At any rate, I don't think there are any methods to mod online on Xbox One. Even so, if people found a way to cheat on Xbox One Fortnite they wouldn't mod player models before finding a way to add permanent radar or eliminate recoil (and then promptly capitalize on it by selling it).i have no idea what this is