It may depend on the nature of those deductions. If a large portion of those deductions are from State and Local taxes, TurboTax can only count the first $10,000 toward the deductible amount. This is the most common reason for the standard deduction to be used even when the input of deductible items exceeds the standard deduction amount.
If after reducing your state taxes to $10,000 and adding the other items back you are still seeing more than the standard deduction, you could be running into some other limitations such as limitations on charitable deductions or medical deductions not exceeding 7.5% of your Adjusted Gross Income (AGI).
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