Only $1000 of the potential $2500 is refundable. The $818 on line 3 of schedule 3* was all that was needed to get your tax liability down to 0. The refundable $1000 is on line 18c of form 1040.
*Also shown on line 19 of form 8863 and is all or part of the amount on line 13b of form 1040.
