Mod not unlocking for Jaguar XKR in NFS Most Wanted

I have gold bars next to each event for the Jaguar XKR meaning I have won all the events for that car.  However it still shows the Aero Body as being locked.  It says I need to win the event "Burning Rubber" to unlock the Aero Body.  But I've already won that event.  Is there a glitch somewhere I don't know about?