Why does this say my handicap is 2.8?

[KiawahConnor]

I wasn’t really sure where to post this but I have been playing a lot lately and shooting mainly high seventies to low eighties and playing with some better players. I sometimes remember to use the GolfLogix app, and I’ve put a few scores in there and it’s telling me my handicap is a 2.8. I don’t understand though. I’ve never shot low seventies, so how can shooting around 80 equate to a 2.8 handicap? I do play well, and I often play from either the back tees or one up from there, between the tips and the white tees, and I am decent I guess. I hit fairways, I drive 270-300 depending on the course and rollout, and I get up and down frequently. My score gets screwed by a random double bogey, or a couple of bogey three putts. 

 

So I’m just wondering if I’m actually a 2.8 or if I’m more like a 9-10. Stupid questions I’m sure, but this app confuses me. 

[iacas]

You have nine rounds, so it's using your three best rounds to calculate your handicap.

http://www.usga.org/content/usga/home-page/handicapping/handicap-manual.html#!rule-14389

77, 77, 76 on a course rated 73.2/134 would be 2.8.

((77+77+76)/3−73.2)×113/134×0.96 =~ 2.8