When I had air suspension on my Disco I had this problem a couple of times. I just connected Nanocom and raised it up to the height I wanted and stored this ride height. Kinda calibrated the height.
I my eyes not two sensors are the same or will give the same signal even at same height, so I will always recommend calibration with Nanocom or similar. You might get away with just replacing a sensor or sway them around so a different part of the pot is used, but I would still recommend calibration unless you are happy with the outcome.
Hope it makes sense.
2001 Discovery TD5 Adventurer, QT Diff guards, TP Steering Guard, Hurst Rock/Tree sliders, Guardian Tank Guard, Southdown Raised Air intake, Modified slimline HD Bumper, SD Highliner Roofrack, Bighorn's, De EGR'ed and TF +2" lift