The JFC "dial" is actually the tank, rotate it right = FULL , to the left = OFF. Mine moves very easily, don't have to look at the icons at all.
Mine too. That is not the main problem, the main problem is closing it does not prevent leaking when refilling.
So far, I have only refill once witouht leaking the rest all incur leaking.
This is the first tank that behave so odd... my biggest frustration is I couldn't really figure out what make it stop after the leaking starts. It seems a quick close back of the top cap is the trick but I am yet to test it a few more rounds to come to a conclusion.
My advice is don't buy this tank if "leaking" when refilling is your concern.
Btw, I am not buying this tank for its dual coil deck, so, all my experience and observation on this tank is based on its single coil deck.