Hi,
If you go to this link you see that this owner has got 23 listings,
personal.jpgbut if you click the listings, it says " This dealer has no listings yet" and no listings shows up.nolistings.png

Think it is easy fix for you.

While you are at it, the map doesn't show the letters for different listings, click new listings, the map on top with a lot of pointer but no A,B,C etc on the map.