National Oak Flooring Manufacturers Assn. Generally this is not the case. Other factors may also cause the drum to mark the floor.
Problems are identifiable as marks across the line of travel of the sanding machine.
The marks show up best when the floor or test board is wiped with a damp cloth. Check wheel bearings for roughness. Check pulley alignment, check belts for hard spots or unbalance. Check for worn shafts, or worn pulleys. Blow out the inside space and paper slot with compressed air.