'Net Calories' Seemingly Flawed Math?

Why don't the normal view and the net calorie view more or less match up? Isn't it a simple:

(calories eaten) - (natural calories burned + exercise calories burned) = net calories ?

In the net calorie view it starts me off as burning 'x of 1643' calories a day. When I logged 438 calories of exercise the counter didn't do 1643 + 438 = 2081 burned calories for the day, it said '1876' calories were burned today.

Someone tell me where that number came from and why 200 of my calories went up in smoke?

And today it says I burned 2,037, but the basic math of 1643 + 79 + 657 equals 2379, so I'm missing 342 calories today, which is more than a meal!

Edit: Someone explained that when you add in an hour of exercise, CC subtracts an hour worth of the existing base calories (so you don't think you burn more than you do).

Sorry are you thinking your 'cals burned' is 'x' and not the end of the day 'total cals burned'? The cals burned (so far) is CC's estimate of how many calories you have burn so far in a 24 hours period maxing out and resting at midnight your time. 'x' calories is also referred as 'other calories' I believe.

Or are you talking about remaining&nb sp;calories? (which if you don't have your account set up for it can be confusing cause you have to pick either net cals or zeroing out with remaining calories)

Hope this helps and doesn't add more confusion.