Beats me but ... If it's on line 10a that would be a problem. It needs to be on 10b. You should be able to check by opening the "Forms" + "Form 1040".
I took the standard deduction. If you itemized it may be looking for applicable itemized charity deductions for justification.
I don't know if tax forms are getting more complicated or TurboTax is making it worse than it should be but it seems to be more difficult every year.
