the only thing i could think of is probably they were made like that so the driver wouldnt be disturbed by the light(if were to be too bright). but you should get it checked just in case...

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BMW X5 3.0 si
Space Grey
Black Int.
Sports Package
(I want that Aero-Kit)
Custom Work... All me
H8 Artic White Nokya Angel Eyes
H11 Artic White Nokya Fog Lamps
Dark Smoked-Out Rear Lights
Dark Smoked-Out Top Brake Light
Dark Smoked-Out Side Markers
Blacked-Out Rear Reflectors
Blacked-Out Front Reflectors
Blacked-Out Mesh Grille