For the majority of high-handicap golfers, the driver is the most difficult club in the bag to hit.
The driver is the longest club, and it has the least amount of loft. It will slice more often than not. Pros set up with their spine tilted away from the target at address. This helps them give the ball a more sweeping blow. As opposed to high-handicappers who may lack strength and mobility in spine and hips and set up too much on top of the ball at address, this makes them hit down on the ball. If you have marks on top of your driver, then this may be the culprit.