you have something wierd and illogical going on and you just added buildings for the carthaginians.....

adding new buildings carthaginian culture can build - if you haven't made the necessary adjustment (deleting duplicate look-up line) in descr_ui_buildings.txt
does the following:
-if you delete the map.rwm it causes CTD
-if you don't delete the map.rwm you just get really illogical little wierdnesses (like your current problem)

check that you changed the descr_ui_buildings.txt file and also delete / rename your map.rwm if you haven't already