Question Unwanted Pelvis movement with some jitter values while playing fbx animation clips

Hi, I'm facing an issue with unwanted pelvis movement while playing fbx imported animation clips.
In clips there are Animator.Root T and Q keyed which are having some jitter values even if they are not keyed from the animation side. And even if these keys are deleted or modified such that start and end frame have the same value, still I can see the pelvis moving.
Does anyone know what's the issue that's causing the pelvis movement.

Attached video for reference.