Have you checked whether the self-levelling is actually working, and the light is not stuck in the wrong position. Do they move?

When you turn the lights on they should cycle vertically whilst the levelling system checks the car's weight and loading via the suspension sensors.

In the UK the passenger side should be higher so you keep the kerb illuminated and not the oncoming drivers eyes

The two X5 in the family have the passenger side headlights a bit higher than the driver side

Check here:

http://www.danielsternlighting.com/tech/aim/aim.html