There seems to be a bug of some sort that's been happening for over a month where selecting a custom skin within the skin creator, changes the skin of another player that is using a custom skin of their own and when someone goes into the pause menu. For example, I'm using a skin based on a character from the Fatal Furry videogame series, the skin ends up applying itself on the other player(s) that are using a completely different skin. Sometimes it doesn't fix itself when I select a skin from a skin pack I had purchased a while back. This is already annoying both me and my friends when were try to switch skins in-game. Now for the pause menu, when we do a skin change again when not in a game, then someone joins in just fine, anyone with a custom skin goes into the pause menu. It ends up changing the skin of another player and sometimes certain players can see the change while the others don't see it which is confusing.
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Here are screenshots between a friend of mine and myself doing a skin change.
Edit: Added 4th screenshot