Is this what you mean by the nut?if it does that same kind of move and go back motion on both ends of the knob (10 and 0) then it’s likely the pot is a little loose and it just needs the nut tightened a bit.
You can move it a little because that’s the amount of travel one of the wires is allowing for, and when you let it go, said wires pull it back into place, or close.
At least that’s been the culprit when I’ve had that happen.
I didn't fix it. Can you explain your post?Did you resolve this already?
My very first thought was a sloppy or worn out DIY no-load pot alteration with nail polish...but that can only be if not the whole pot is turning.