Character rotation jittering and not working properly

I’m prototyping a basic multiplayer fps, but I’ve already gotten stuck and can’t find answers.
Put simply: I’d like my actor to rotate so the mesh and other components rotate on everyone else’s screens. But the rotation seems locked and jittery.
Here is an example of what it looks like (I am rotating the other player left and right smoothly, and the camera is rotating fine, but not the mesh:

And here is my node setup:

Please help me out!