Yea I've had that happen with my zerobots too, I get it alot with alga minimalis. It apears as though there is a central axis of that grouping with a radial pattern emenating from the center. Also there apears to be a diamond pattern in the way big berthas are spread throughout.
Attached is a really cool mutation that I got from AM within 4k cycles of a torridal sim, it is pretty funny to watch, nothing I put it up against can stay alive exept tie feeders.
edit: Sorry guys, I didnt read the subforum it was in, my post is in the wrong area