Ok, let me explain what I've seen in case you might have missed some of it or for some reason the sim decides not to behave the same on your computers.
SPOILER:
When you load the sim you should see this:
The bots start to swim down the screen a little and then stops. Then they just sit there and grow. (day/night cycles are set to 25000). After about 32000 cycles they (or the one that might be left) starts to reproduce. The child that is born waits a while, then it swims down under the parent slightly to the right. The next child that is born places itself under the first child, and so on, until they line up. After awhile when the line of bots has grown a little something interesting happen. The bots that are born are not just placing themselves at the end of the line. They now slowly search down the line to find a gap to fill. You might see a bot that stops to inspect a gap for a few cycles, but then decide to continue to search down the line to find another gap. When it finds a place it likes it will stay there. The bots mostly reproduce at night, but a few times at day. When the bots in the line has grown larger, the new bots that are born tend to place themselves close to the bigger ones to start and form a new line. Sometimes they try to push themselves in between the bigger bots to create a new colony with smaller bots. Also you might see what appears to be synchronized virus reproduction. A bunch of bots close to each other might send out viruses at exactly the same time.
I've tried to run this bot species under different conditions, drifting shapes, other bots in the sim at the same time, or a larger amount of bots in the start, but then this behavior gets disrupted and they just floot around reproducing randomly.
So maybe if someone could dig through the dna to see what is triggering it's behavior, but there are a lot of dna in there so it might be hard. In any case this behavior seems to be dependent of a bunch of factors.