Mine lowers more in the right side also. I just chalked it up to the height knob being on the left. It's a machine. There are tolerances. As others have stated, just make sure to level it with it resting on the height adjustment control. My dealer said they leveled my deck before it was delivered. It was off almost 3/4 of an inch when I checked it on level concrete. Right side was higher. I'm assuming they leveled it without setting it down on the height control mechanism.