iOS App issue

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Hi,
I'm using the app on the iPhone and am happy with it (so far lost 2 stone since August).
The problem I have is with when I save the daily diary it keeps telling me I'm not eating enough and that I should increase my calorie intake to 1200. Most days I am about 10-50 calories over this.
My partner is using the same app, and usually eating the same meals, and hers tells her the projected weight in 5 weeks.
Any idea what's wrong?