Eck you just confused me to death with all them numbers ...lol Anyways, the only thing I have ever noticed on fitday is .. they do kind of "round up"

I don't know if this is what you're talking about or anything but I noticed that if something has like 4.2 carbs.. thats 4 carbs..
Then something else will be 5. 4 carbs..(5 carbs)
Then something else you eat might be 2.2 carbs...(2 carbs)

Fitday won't technically show that in its totals ( I forgot where I saw this, I think when you customize the nutrition labels.) But it WILL add it up as so:
4.2
5.4
2.3
------
11.9 carbs.. Fitday will round it up to 12 carbs.

So it's not totally inaccurate.