Thank you for providing your file. The children's information is input correctly. I have reviewed the information, and your income tax is computed at $360 on your 1040 Line 16, which is the amount of Child Tax Credit you've received. The additional tax that you are being charged is self-employment tax, which cannot be reduced for Child Tax Credit, as @SteamTrain mentioned.
Here is some more information you may find helpful: Child Tax Credit for 2024 - 2025
