When showing you a total deduction amount, TurboTax may also include 'adjustments' to income in addition to items labeled as 'deductions'. Take a look at your Form 1040 Schedule 1 lines 11 through 24 to see if there are adjustments listed there that would make up the difference.
Some common adjustments are a portion of self-employment tax, self-employed health insurance, IRA deductions, HSA deductions, and other items.
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