Player shot bullets target fire if pointed in its general direction, even when aliens are present. Also, the spidertron will continually shoot rockets into fires, mods that cause explosive rockets to create fire can cause an endless loop of spidertron wasting stacks of rockets on the fire until either it runs out, moves or the fire is extinguished.

Known, old issue, author doesn't know of a way to fix it.
https://mods.factorio.com/mod/WaterTurret/discussion/5f85f94eee4cd5237620b0ce

Affects anything which shoots things and is AI-controlled, including artillery (!) and AAI chaingunners. Which seriously puts a damper on the cost-to-benefit ratio of this mod, sadly. Particularly if you have exploding biters.