There are two things you can check.
The first one is to go through all of your input to make sure it was done correctly. You may have a number in the computer that doesn't match your added up deductions.
The second one is to go through the return. Click Done with Deductions after you've double-checked the amounts. Depending on what your return looks like, you'll see a screen that has three colored progress bars and says Analyzing your Return.
Continue till you get to a screen that says Let's See if the Standard Deduction is Right for You. There's a check box at the bottom, Change my deduction. Check that box, and see if anything changes.
If you still need more help, post back to THIS thread.