Taxable IRA Distribution

2024 Turbotax is not correctly calculating the taxable amount due on line 4b given the IRA distribution on line 4a and the reported QCDs for the year. The taxable amount (4b) is calculated to be $10437 less than the amount distributed however I had only declared $6750 in QCD. The taxable amount on line 4b should be less than the amount distributed on line 4a by only $6750.  I do not have Roth IRAs or anything complicated like that.