rotationAngleX not returning angle of given player instance

[FaaatPotato]

context:

I've recently posted this script in which I messed with the players model and the different rotation angles which I built into an animation. However the script seems to apply angles of one players model to another. Hence the animation is broken.

//function to retrive the MainModel to access rotationAngle... and do rendering
function getMainModel(entity) {
   return mc.getRenderManager().getEntityRenderObject(entity).getMainModel()
}

---

fast forward to today

I sat down and again tried to fix the issue. I've noticed that this in Multiplayer

Chat.print(getMainModel(mc.thePlayer).bipedRightArm.rotateAngleX)

doesn't even return the given instances' bipedRightArm.rotateAngleX rather some angle of another player. However, in Singleplayer it seems to work, probably because theres just one player, me.

showcase:
rotation singleplayer – 00:08
— FaaatPotato

rotation multiplayer – 00:05
— FaaatPotato

In Singleplayer a drastic change in the angle is noticable while hitting. However in Multiplayer this can't be said at all times.

Does anybody know how to fix this/know another method to retrieve the rigtht angle? Or more importantly explain this behaviour?