I have enough deductions to itemize, but why didn't the Federal Tax Calculator decrease in amount when I entered all my Schedule A deductions?

I know that deduction for taxes is limited to $10,000 and I maxed out on that. I also have a lot of mortgage interest (more than $14,000), but as I entered my deductions for taxes and mortgage interest there was no effect on the Federal Tax Calculator at the top of the screen. It did decrease when I entered my charitable contributions, but not taxes and mortgage interest. Do I have a faulty program (and thus will be  paying more than I should have to)?