This is an odd bug that came up when I was playing my Sandbox level.
In any case, halfway through the game my Hatchery stopped producing Chickens. Pretty Scary... I managed to resolve it by possessing Horny and killing one Player.
It stabilised, but shortly after it came back again and I got rid of the other Player, then it was all OK.
I can only guess that there's some limit on the number of "Things", referring to things like chickens on the level at any one time. I had 2 Hatcheries, and my enemies (2 Players) had 3 Hatcheries.
Note they each had 40 Creatures, I had 70 Creatures, and Player Good had something like 20 Creatures.
On the side note, there were some "wellknown" bugs occurring, such as that the AI was producing things like putting multiple traps on a single square. And he had a lot of trapboxes and a lot of workshops.. something like 6-8 separate workshops per player.
There was even a very strange situation where he put a Lava Trap under a Workshop... And so to clear the tile, I built a bridge over the Lava, and Sold the Workshop then the Bridge and it was gone, yes.. to reveal Water Beneath. Most interesting!
In any case, this is just for info. Its probably not something that's going to happen in a normal game, I think... Hope this helps!