How do I confirm my dependents are correct vs. what IRS says? I filed taxes using TurboTax. IRS responded with, 'We changed...amount claimed...nonrefundable CTC."

..."nonrefundable Child Tax Credit or credit for other dependents on your tax return because you either didn't enter an amount [note: this isn't true] or entered an incorrect amount based on the number of boxes you checked on page 1 of your return".