Disco 4 (LR4) Suspension heights different for each wheel

Just noticed this while in access height.
So I measured the distance between the wheel-arch top and the tyre (approx):

Off-road:
Drivers front: 6 ins
Drivers rear: 7 ins
Passengers front: 6 ins
Passengers rear: 8 ins

Normal:
Drivers front: 4 1/2 ins
Drivers rear: 5 ins
Passengers front: 4 1/2 ins
Passengers rear: 5 1/2 ins

Access height:
Drivers front: 3 ins
Drivers rear: 3 ins
Passengers front: 3 ins
Passengers rear: 3 1/2 ins

When I measure it it doesn't seem a lot, but it looks quite obvious.
Is this a recalibration thing that only dealers can do?

You can do it yourself too if you have the proper equipment