For the 2024 tax year, I am trying to figure out why TurboTax used the Schedule D Tax Worksheet to calculate Line 9 on Form 8615 vs. the Qualified Dividends and Capital Gains Tax Worksheet.

My situation: Form 8615 Line 8 includes amounts from my (parent's) taxable income, which includes qualified dividends.  Line 8 also includes amounts from my son's net unearned income, which also includes qualified dividends (via line 5, I presume).  Based on how I interpret the Line 9 instructions ( https://www.irs.gov/instructions/i8615#en_US_2024_publink28914rd0e523 ), that means I should be using the Qualified Dividends and Capital Gains Tax Worksheet vs. what TurboTax used - the Schedule D Tax Worksheet. 

There is no Schedule J on my (parent's) tax return, and there is no 28% rate gain or unrecaptured section 1250 gain on any of our tax returns.  There is also no Form 2555 filed on the child's return.

Form 8615 lines 1 - 5 are as follows:

1) 2,954

2) 2,600

3) 354

4) 2,504

5) 354

Line 6 is my (parent's) taxable income from my Form 1040, line 15 which is inclusive of qualified dividends.

What am I missing? I am sure I am misinterpreting something but I cannot figure out what.

Thank you!