Animations work in Editor but not on Standalone

Could anyone point me in the right direction of this issue? (I would provide videos or screenshots but none of the software wants to actually record it correctly)

Basically I have it to where the player can select a character in the lobby before starting the game and joining an online session. Upon selecting a character and starting a match, both player connect in the editor and all the animations and everything work perfectly fine, there are no problems at all

However when I boot up the game in standalone to test multiplayer features, suddenly everyone’s backs are broken and the movements are only replicated for the host but not any of the clients. I assume this has something to do with the wrong anim instance being used, but I have checked thoroughly and nothing seems out of place!

Any help would be appreciated!