Smoant Battlestar showing 0.00V but seems to be working fine

So the basics, I vape in wattage mode on TFV8 X4 coils. They run .15Ohm but detect anywhere between .15 and .18. I haven't had a problem with the setup and haven't noticed this before so there's no telling how long it's been going on but it's just sitting on 0.00V but working fine AFAIK. I hit the button and it's firing but V is 0. I finally pulled the battery and put it back in and it's OK now, showing proper voltage, but I'm just trying to figure out if it's something to be worried about.

Edit: It's showing 0.00V while firing