The way to figure out what's going on is to look at Form IT-196 to see the calculation of the New York itemized deductions. But the tag below your question indicates that you are using TurboTax Online. In TurboTax Online there's no way to see a form that is not included in your tax return, and IT-196 would not be included if you are getting the standard deduction. You might want to work through Form IT-196 by hand and see what the result is. If you do that, look at your actual tax returns in TurboTax and use only information from there, and follow the IT-196 instructions carefully.
Form IT-196
Form IT-196 Instructions
If you were using the CD/Download TurboTax software you could just go to forms mode and open Form IT-196, even if it's not included in your tax return. The ability to look at any form is one of the many advantages of the CD/Download software.
As an alternative, you could call TurboTax support. With your permission they can look at your tax return, which we cannot do here in the community.
