Have you been subracting your fiber for the day? Go to goals and ask it to track fiber and carbs. Then at day's end, go to report and see the custom goals for the day. Subract fiber and there you have your net carbs.

For instance, to day before lunch, my fitday already shows 22 carbs. But if I subract my fiber today I'm down to 10 carbs. I have a 15 gm bowl of flaxmeal daily that has 12 gms of fiber listed