Friends and I keep switching skins on multiplayer

Since after iOS Minecraft crashed for a weekend sometime in late January 2020, odd things have been happening to the game when I play with my friends— even after I deleted it and got it back. The most noticeable issue is skin-switching. When I play single player, my custom slim-arm skin is what I chose it to be. Then if one friend joins me, my skin will become her skin. When there’s 3 of us, our skins will rotate except for me being my own... so my character becomes Friend 1’s skin, then Friend 2’s skin, and back to Friend 1’s skin. On their end, they are also everyone else’s skin but their own. However, there are two different friends we play with whose skins never switch! They wear “official” Minecraft skins made on the Character Creator and I think that somehow blocks the issue. I accidentally logged in as an Alex once and my skin didn’t switch.