Itemized deductions aren't adding up right; standard deduction seems wrong

Hi experts, I hope someone can help.

 

Last year my itemized expenses exceeded my standard deduction, and I took that deduction. This year looks the same, but TurboTax believes the standard deduction is right for me. I don't understand it.

 

  • I'm married, filing jointly, so my standard deduction (if taken) is $24,800
  • TurboTax believes my itemized deductions total $21,904
  • I don't see where $21,904 comes from;
    • My mortgage interest were $22,530
    • My property taxes were $6,523
    • My charitable donations totaled $2,525
    • Aren't these all deductible, for a total of $31,578?

 

Here is a possible hint, though I don't understand it. I refinanced my mortgage towards the end of 2020. I paid about $21,000 on the loan before refinancing, and then about $1,500 on the new loan. If I remove the new loan, suddenly the math makes sense to me, and TurboTax recommends the itemized deductions. It seems something about this new loan throws everything off, but I don't understand how.