I noticed that my older car started appearing in the showroom all of a sudden. When I compared the stats it was because somehow some of the cars were losing the Car Music and Bluetooth property on export. I followed some cars to make sure they had the property (all the cars had to have it because every car ran through 1 electronics bay before 2 QAs and Export). To see if the QAs were dropping it I checked the cars after the QA and they still had Music and Bluetooth. For some reason when some cars were being exported though my car model without the music and bluetooth was going up in count in the showroom.