Multiplayer mounting bug

Im having a problem that when my friend try to mount my salamence with me he just stays in the air and doesnt actually ride with me, he just stays there and if he tries to un mount he teleport to my pokemon like if he was mounting with me.

This only happened to me with Salamence and no other pokemon at the moment, and the only addon we are using is Cobblemon Mega Showdonw.

Anyone that had the same problem?