I believe ODE is badly behaved because of floating point errors and timing fluctuations that make the whole thing rather chaotic (literally). C.Brutail and divVerent experienced this while recording the orchestra demo: they had to restart it a few times because the ODE parts would not work the right way. And the bots have no influence on the physical stuff in the background on that map as far as I know, so ODE in DP is pretty bad at what it's doing.
EDIT: Taoki: look up determinism on Wikipedia.
EDIT: Taoki: look up determinism on Wikipedia.