Power supply Question

I have a Flex 6600M that I am powering with a DC regulated power supply, the Victory PS 25, that I purchased quite a few years ago. It provides excellent stability for the radio. My question is this: When I turn on the power supply, the 6600M briefly flashes some panel lights, then remains dark until I actually press the ON button. No problems working the radio, and no noise from the power supply. When I turn the radio off, I first power down the 6600M, wait till it goes completely dark, then power down the power supply. When I do that, there is a 1 second red flash of the red power button on the 6600M, and then all is well, system off. Is this the way things are supposed to work?