[ODE] asymmetry in simulation

[Kay]

Hi, All:

I built a character with perfect symmetric limbs with amotors, but somehow after only one step of simulation the velocities of the left and right side of the bodies start to differ(around 1e-17 for a simulation step about 0.001), with or without symmetric forces. Is this normal due to the simulation errors? Is there anyway to preserve symmetry? Or maybe there is something that I did wrong which caused the asymmetric drifts? 

-Kay
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