I don't know the details of your return, but it is possible that your property tax deduction is being limited by the new $10,000 cap now imposed on total itemized deductions for taxes. This would include all deductions for taxes, including state and local tax withholding, state and local personal property taxes, etc.
You would enter your property taxes under the Personal section of your return under Deductions & Credits / Your Home / Property Taxes. You'll enter your property taxes in the line "Property tax on your main home".
