Hmmm.... I don't know if those are in spec or not but they seem to be. The number are arbitrary like I said before, hence the calibration. Which takes that voltage reading and learns that the reading is is getting is "zero" for height. Your actual heights are fine, they are barely off from zero which means you are on pretty flat ground based on the calibration.

You could inspect the sensors themselves, make sure the attaching arm can move freely in the metal mount/hook the the end goes onto. Silicone spray helps if they are binding. You can also make sure the sensor body itself is secure and not moving around. Also check the wires when looking. At the front oversized tires have been known to rip up the wires.

After all that I can only say to try a calibration yet again and see what happens. I know the last time I did mine I had to go around four times to get it where I wanted.

 

Drove the rover today and now things are a lot closer. You were right, just needed to settle out. Will check again tomorrow.