Skin glitching, skin duplicating, skin menu doesn't work

All of our skins are steve and alex and if we change our skin on the pause menu, game crashes and sometimes it won't turn is back to the game.
Sometimes my skin will also change automatically into what other player's skin. It duplicates every skin. Please fix thisss the skin menu also is a bug. It doesn't show our skins that we saved and made. It's just loading .