Deductions & credits

So on Schedule 8812, line 27 it was blank.  Line 14 was $2000 so this looks like the standard child tax credit.  This lowered my taxes due from $7500 to $5500 resulting in a tax refund of $2500.  I was under the impression that if I am getting a refund that I can't use that full $2000 but maybe I am just mistaken at how I am interpreting how to apply the child tax credit?  Can you try to explain?  Thanks