The federal standard deduction for filers under the age of 65 is $12,400 (single), $24,800 (married-joint), $18,650 (head of household).
You will have a chance to review Schedule A, which is the itemized deduction schedule, before you file your tax return after you pay for your TurboTax program.
What may be happening is that your computer is not interacting properly with TurboTax. You can try clearing the cache and browser history in your computer and that may resolve the issue. Her is an article that may help you with this:
https://support.google.com/accounts/answer/32050?co=GENIE.Platform%3DDesktop&hl=en
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