Two dipstick malfunctions - the mechanical one and the owner (who fired you "on the spot"). Three if you count his calibration skills. I'm glad you re-fueled the airplane when you didn't have to.

You saved the owner's ass too (figuratively), not to mention possibly a pilot and jumpers; eventually somebody would have run out of fuel.

Hang in there - but be careful, though. This sounds like an all too typical jump operation. A violation or accident will put a dent in your career hopes as well as possibly your body.