First the CTC on line 19 of your Form 1040 is used to pay your tax liability -- if It is down to zero, then the remaining amount of "additional child tax credit" of up to $1700 per child can go down to line 28 as a refundable amount. If you do not see much on line 28, the CTC was used to keep you from owing a big tax bill.
Look at your 2024 Form 1040 to see the child-related credits you received
PREVIEW 1040
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...
Child Tax Credit line 19
Credit for Other Dependents line 19
Earned Income Credit line 27
Additional Child Tax Credit line 28
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