Volume resets to 26 every time unit powers on

Every time I start the vehicle or power on with the key, the unit goes to a volume setting of 26. It does not remember my last setting and resume it like every other stereo I've owned. Does not matter what mode it is in, (dvd, sd card, cd, radio). I just purchased this from Circuit City as an open box unit and didn't get a manual so I'm struggling a little in getting up to speed.