My Garmin Has Gone Haywire

I'm pretty sure my Garmin watch has malfunctioned: It says I ran a 5K in 12:07, the world record is 12:35. I'm pretty fit for my age, but the longest I could keep up a 4:00/mile pace was 1/4 mile, when I was 18.

Also, this watch calculates VO2 Max.  The data it has available for this are, my weight, pulse and how fast I'm going.  Men who can run 4:00 minute miles have VO2 Max levels in the low 80's, so why did it give me a 42 for the day?  Normally I get around 45.

Right before the run, the watch wanted to update the software, but I post phoned that for later.  Maybe that's why its brains were scrambled.