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A topped golf shot is caused by a player hitting the ball above its equator. Compare this to a thinned shot where the leading edge of the club face catches the ball below the equator but not low enough to make full contact.
Higher than desired spin on the driver typically comes more from the golfer having a little more downward angle of attack into the ball or, from the golfer allowing the clubhead to slightly pass in front of the hands so the dynamic loft on the face is higher at impact than the actual static loft on the face.