How much is your mortgage interest, and do you have any other itemized deductions other than mortgage interest?
The recent changes in 2018 may have resulted in the standard deduction being more advantageous to you. Starting in 2018 the standard deduction is as follows:
Single/Married Filing Separate- $12,000
Head of Household- $18,000
Married Filing Joint- $24,000
If your standard deduction is higher TurboTax would utilize that vs itemizing (which is where mortgage interest is shown).