Hi Alex,
sorry but it seems nobody has ever heard about that problem. As I did not. Only thing I could think about would be that your wheel doesnt move the part it should move behind the outlets. Ever thought about removing the outlets to have a look behind it?
#1 in here:
RealOEM.com * BMW E53 X5 3.0d AIR OUTLET
Good luck and keep us updated when you find out what happened.