There are a couple of possible reasons for that.
The non refundable portion of the Child Tax credit is $600 per child If you only had a $2,000 tax liability the Child tax Credit will show that way with the refundable portion listed as Additional Child Tax Credit.
All 4 children are age 17 or above. Or,
The children are not entered properly
To change dependent information in TurboTax:
Open your return go to My Info or Personal Info
Scroll to the dependent you need to change select Edit
Make the needed changes
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