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Incorrect calorie burn is often down to one or more of your profile settings being incorrect (age, height, weight etc). You can check yours at https://www.fitbit.com/settings/profile
Another possibility is that the number may not be wrong. Are you taking into account your BMR calories? These are the calories you burn just keeping your body alive and for many people they are more than those calories burned through activity. It's hard to say whether your numbers are ok as the bigger you are the more your BMR calories. There are online BMR calculators if you want to look into this a bit more.
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