Hello!

I play factorio with alot of enemy mods. Cold Biters, explosives, armored, big monsters, natural evolution enemies, rampant.

What I noted is that with bobs enemies loaded, the biters even under the pollution cover, just walk around and dont form groups to attack my base.

I deactivated the bobs enemies mods, and reload my save. After some minutes the biters started to attack non-stop.

Is this happens with any other too? Maybe is a conflict with other mod enemy ai behavior?

I am unaware of any conflict issues that could cause this.
My mod doesn't attempt any fancing new AI or scripting or anything like that, it just adds new enemies to the game and lets the existing AI control system handle their behaviour.