Fire calls being most of the time house fires

hello everyone! I've been noticing that in my map, buindings, expecially the original ones with the base game fire objects tend to be the most common thing to catch fire, despite being a very few in the map compared to other objects.
I have a lot of new objects in the map with new fire objects still catch fire but is a lot less common.
do you know how could I fix this?
I chechked fire object materials and tried to use original game materials but nothing.