Car type feature in the car dealer theme not working properly

With reference to the feature on the front page of the dealer demo that has silhouettes of cars and labels underneath of sedan, coupe etc. When you add a new listing, in the listing details section a dropdown box comes up with these car types listed. If you click sedan and save the listing I would expect that listing to come up when you click the sedan icon on the front page. However when you click on a car type on this feature it brings up all listings and not just sedans or coupes etc. Can someone explain to me how to link it up so that when you click sedans you get just sedans. It doesn’t work in the demo either which is a little worrying.
I am just wondering is cartypes a taxonomy, category or something else?
Incidentally I have tried three times to get an answer on this, should I raise a ticket?