Ball (or ball-marker) moved - By another ball
If it is known or virtually certain that your ball at rest was moved by another ball in motion, there is no penalty and your ball must be replaced on its original spot (which if not known must be estimated). The other ball should be played as it lies.
But see scenarios relating to ‘ball in motion deflected’ for whether a penalty applies to the player whose ball in motion caused your ball to move on the putting green.