Sorry---you misunderstood. The amount of the refundable child tax credit is based on the amount above $2500 multiplied by 15%. Over $2500 of earned income does not mean you get the full amount.
You should also be getting some amount of earned income credit, but that is based on no more than three children, even if you have more than three. Check line 27 of your Form 1040 for your EIC.
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