MFP keeps lowering the calories

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So after my workout each evening I sync my Fitbit One and my MFP app so I know how many calories I have left for the day so I know what I can eat for supper. I've recently noticed that while I record my log for the day say at 101 calories lever over on MFP the next moring when I wake up it will show a negative amount like -89 calories left. Why is this. I also noticed the calorie adjustment MFP does because my Fitbit One goes down as the night goes on too. Even though the amount of steps I take continues to increase until I am in bed for the night? Can someone please tell me what is going on?

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