Firstly. do you have Adaptive Drive as well as the self-levelling suspension on the rear!

There are sensors that check the height & whether the car is level. I had a sensor on the righthand rear fail once and it droped that righthand rear side of the X5 down by 20mm.

In the pdf of the self-levelling suspension it talks about the minium height and how to setup the sensors. In thoery one could recaliabrate the height but I don't think BMW would let you do it. Companies like Dinan probably could or some of the other highend tuners.

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X5 M50d White | 20" Rims | Adaptive Drive, Self-Lvl Susp | Act/Steer | HUD | Xenon, Adapt Lights | H-Beam Ast | Rear/Side Camera | Panorama S/roof | Auto Tailgate | Comfort, Active, Ventilated, Heating, Lumbar, Navada Perforated Leather Seats | Comfort Access | M-Steer Wheel w Pdle Shift |Sports 8-Speed | Active Crus Stop/Go | Proff Nav + TV, DAB | 16 Spk Ind Audio | USB |Internet-eMail-SMS-Apps | 4 Zone Air | Speed D/play | Towbar | 20% Tint | 5mm Castor Bushes | Yellow Calipers, Ceramic Pads |