My skins sometimes switch when I play with someone who is on the same Wi-Fi as me

Whenever I play with someone who is on the same Wi-Fi as me, our skins switch.

Sometimes I am in theirs, sometimes they are in mine.

It is really annoying and it is confusing for people who aren't effected because they aren't on the same Wi-Fi network as me.

Please find a way to fix this bug.