It doesn't sound like you're using it quite right or something is very wrong.
Let's say it's just sitting there. You pick it up and click 5 times quickly and it will go to power up,
two more clicks to power down, etc.
When you've set the power level at whatever you like, release the button and give it a second or two for the screen to go dark. Then you just press the firing button and vape. The only thing I can think of is that you're firing before it's set.
One of the reasons I prefer the ProVari to the Vamo is because with the Vamo I often press the adjust buttons when I press the fire button. There's no way to shut off the ProVari menu screen because it won't turn on without clicking it 5 times. If it's changing on you if you just pick it up and vape, you need to contact ProVape.
ETA: Scroll down to "instruction manuals" and you can download a pdf of the manual.
ProVari Variable Voltage Ecig: Best Variable Voltage E Cig Available!