If your Mortgage Interest and Refinancing (Form 1098) is showing values in TurboTax without you entering any information, it could be due to a few reasons:
If you previously entered information related to rental or business use of your home, TurboTax might carry over the personal use portion of your mortgage interest to the deductions section
TurboTax sometimes pre-fills certain sections based on previous returns or imported data. This can include mortgage interest if it was part of your prior year's return.