My friend and I have our skins on the client, but only my skin loads and his does not. Instead my friend appears with Steve and a black glitch. He can see his Skin and mine, but I can not see his Skin. We put a third friend of ours on the server, with no skin, and he said he could see me with skin and that my friend (the second one) was with Steve and a black glitch. That friend also had the glitch.

https://i.imgur.com/aJfhHW0.png

I think this is a compatibility issue with other mods, and I'm sorry that I probably won't fix it.