Deductions & credits

Nope.  Here's the situation.  I completed a paper copy of Schedule A.  If you add up my allowable tax deductions which max out at 10k, home mortgage interest and charitable contributions it comes to 15,034.  Turbo tax is saying my total deduction is 15,700. Why?  There is no explanation given.  Like I said I should be glad for the higher deduction amount but it doesn't match my paper schedule A.  Something is wrong.