Destroying spawner reduces biter evolution

[kik4444]

So after a while I noticed that my overall biter evolution was decreasing by around 0.3% every time I destroyed a spawner. After a little fiddling with mods and switching back to a save where I didn't have any I noticed that the cause of this is this mod.

First I enabled it on the map where I never had any mods enabled in the first place and sure enough when I destroyed a spawner the evolution decreased, but then increased (as it should) when I repeated the same thing with the mod disabled.

However when I switch back to my main save the evolution decreases regardless of whether the mod is enabled or not, making me think that the mod might have slightly corrupted the save in this aspect. So is there any way to fix something like this?

It should be noted that I also have a lot of other mods, but the only ones affecting enemies is this one and bob's enemies and based on my tests, bob's enemies definitely isn't the one affecting the evolution factor.

Also, I already have 22 hours into that save and biter evolution is only at 18.9% at the moment.