E84 rear lights

[brazenskies]

Recently I bought a 2012 X1 E84. Since then I've noticed that some of these cars have all the rear lights on at all times when the headlights are turned on, but with others only the outer lights are on (i.e the ones on the boot are not lit). I see that the ones on the boot are also rear fog lights, but he ones I've seen just seem to be the brightness of the standard rear lights.

The lights on my car are the latter and I was wondering if this is correct for the year and were the all-lights-on a change for the 2013- models?

Thanks in advance!