1 If a fader is left on when the console is put into hibernation mode the light will stay on.
2 When the power is disconnected and the console restarts and all the faders are down a light will come on in the rig and follow the colour changes on the console as it starts up.
I have a 20 as well and whenever the console is turned off, our Colorsource pars will turn on and stay on.
Like jbehrle mentioned
Earlier, the lights are just like "I need DMX" and the behavior of them is normal. It happens all of the time at my school with our Colorsource.