After conquering a city as Broken Lords I was able to build a city hall in necrophages city. So that city had 2 city halls and each population gave 8 of (F)IDSI



EDIT: Already acknowledged by developers.

This might be the same bug as described in this thread.



I suspect this happens because technically the Broken Lords City Hall and the city hall of all other factions are two separate data entries, as the BL City Hall does not provide any food per pop.