Custom Skin cloning

Ok so apparently when I join my friend's realm or just a world on pc and when I have a custom skin on and if he has a custom skin on and when I teleport to him or if he teleports to me our skins change

Example: If he teleports to me his skin will change to my skin on his screen

Example 2: if I teleport to him my skin changes to his on my screen

P.S: I wish I knew how to screenshot but idk how to sadly I am sorry