This is my first post so apologies if it is all over the place.
I recently created my own modpack with a friend and we have attempted to play it together but run into a recurring problem. I host it from LAN and set up a port forward, which is how I have played packs in the past, but this time its different. The pack launches fine for him and he can join the server, but when he actually loads into the server he cannot move and his hat layer of his skin does not load in. All his key binds are set correctly and he can still break blocks, but I cannot see his head moving or anything of the sort. If I hit him his screen shakes and remains red. The strange thing is that if I kill him he can move until he relogs. If anybody knows any solutions it would be greatly appreciated, thank you!