Welded humanoid to player wobbles when walking backwards

I’m creating a game where you have a r6 rig welded to you (The weld is between the player’s root part and the npc’s root part). It works fine until you walk backwards, which gives this awkward wobble :
https://gyazo.com/95d9c82721ebbd03b2963b8c89d274fe
What I have done so far trying to prevent this :
-The NPC’s parts are massless
-The NPC’s parts are set in a different collision group, preventing it from colliding with the player’s character

So why is this happening ?

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Instead of welding, you can tween the NPC to you instead which would be a lot smoother

Well after some testing it turns out even when the npc isn’t there, the character will still wobble walking backwards. No idea what would cause this though