I made an estimated tax payment to the IRS on April 8, 2024 before I filed my 2023 return. Will this estimated tax payment be applied to my 2023 return or my 2024 return?

It appears that the IRS added the exact amount of my April 8 estimated tax payment to my 2023 refund, even though I did not file until 2024. Is that correct, or do I need to resubmit the payment so it goes with my 2024 return?