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Possibly they are fianncing the up front reserves for HOA, Home Owners Insurance, and Taxes? Its hard to say without looking at the GFE in detail. These might not be something the program recognizes as closing costs.
Since you are getting an FHA loan the UFMIP is added to the base amount that you borrow for a total loan amount of what you see on your GFE. UFMIP is up front mortgage insurance premium.
Forgot about UFMIP. I bet thats it!
Are you going FHA? Is it the insurance premium?