The $4,000 or $6,000 amount should be your total child tax credit since it doesn't appear that your income reaches the second phaseout amount of $400,000. If you did not receive advanced child tax credit payments, this would be the total child tax credit that was reported on Form 1040 Line 28. It would also be reported on Line 14i of Schedule 8812. If you received advanced child tax credit payments, your total credit reported on 14i and Line 28 of Form 1040 would be $4,000 or $6,000 minus the amount of advanced child tax credit received.
It does look like, based on your Line 5 calculations your AGI of $294,000 exceeded $150,000 and TurboTax did not apply the first phase-out to the child tax credit. If this is correct, you should have gotten $2,000 per child age 6-17, not 3,000 as TurboTax appears to have credited you. I have not seen TurboTax miscalculate this form before.
