Nicolas is correct.

The EV5U and EV5U-Pro have a power-on failsafe, this is designed to eliminate the possibility of the gear retracting upon power-up if the switch happens to be in the wrong position.
If you have initially configured your sequencing in what the valve considers to be gear up setting, the valve will do as you described. Reverse the gear channel, swap your lines on both doors and gear and the problem should be eliminated.
Todd