House payments and property tax and one contribution have been entered but Turbo Tax shows no change in my Federal refund. Is something wrong with the Turbo Tax software?

I have entered my income; Turbo Tax shows a small federal refund. I have entered the interest included in my mortgage payments for 2018 and the property tax I paid and one sizeable charitable contribution, but Turbo Tax is still showing the same Federal refund.  Is something wrong with the Turbo Tax software?