What causes one blade on 42in mower to cut lower than the other?

One blade on a 42-inch mower may cut lower than the other due to uneven deck leveling, where the mower deck is not parallel to the ground. This can result from worn or improperly adjusted deck hangers or suspension. Additionally, variations in blade sharpness or height adjustments could contribute to the uneven cut. Regular maintenance and proper adjustments can help ensure even cutting performance.