My always rolled ever so slightly. Most of my cars do. I just got used to pulling the E brake before hitting park on my 7 series.

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Current Vehicles:
2009 750i fully loaded, Dinan S1, tint all around
2011 Maserati GT Conv.
2008 F250 King Ranch Diesel


Past Vehicles:
2008 M6 Conv
2008 S65 AMG
2009 Lexus LX570
2007 X5 4.8
2008 RR SC
2003 M3 Conv; totalled