For those that use body mediafit

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Hi, I have a body media fit and was wondering if others that use one have encountered widely varying TDEEs despite doing the same activities everyday.

For example, I set my activity level as sedentary on MFP (office job, no exercise other than 2 blocks walking to and from where I park my car and walking to and from the fax machine several times A day) giving me a TDEES calculAtion of 1750. After a week of using my body media I changed my activity level to lightly active because my TDEES readings were in the 1900 to 2000 range. However, I have stArted to get occasional TDEE readings of 2500 to 2600 on my body media even though my days are no different than those with the lower readings. Is this normal to have such a wide variation? I could understand if I was exercising on those days but I'm not. I would expect some variation from day to day but not that much.
Sandra