On the putting green there is no penalty if while moving loose impediments the ball moves. “If a ball or ball-marker is accidentally moved in the process of lifting the ball under a Rule or marking its position, the ball or ball-marker must be replaced. There is no penalty, provided the movement of the ball or ball-marker is directly attributable to the specific act of marking the position of or lifting the ball. Otherwise, the player incurs a penalty of one stroke under this Rule or Rule 18-2a.”

If you move your ball marker on the green to get it out of the way for another player, and then you forget to put it back, it is 2 strokes penalty for palying from the wrong place. You do not need to rectify.”If a ball to be replaced is placed other than on the spot from which it was lifted or moved and the error is not corrected as provided in Rule 20-6, the player incurs the general penalty, loss of hole in match play or two strokes in stroke play, for a breach of the applicable Rule.”