The bug is either in the game itself or in the RMG template editor. The dwellings of the Conflux Elementals, as well as the Nix and Maelstorm of the Cove, have two sprites: one small and one large. Due to this bug, twice as many of these dwellings spawn on the map. This can be checked using the settings as shown in the screenshot. And it's also clear from the code that it adds both sprites as separate buildings. If I understand the underlined text correctly.