You are among many people who answered the recovery rebate credit question incorrectly---either because you did not understand the question or because the money arrived after you filed your return. The IRS cross checks every return that has that credit on it and they will recalculate your refund based on the amount of stimulus you actually received. Sorry--but that will delay your refund.
From this IRS website - https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
As of May 15, 2021, we had 300,000 individual tax returns received prior to 2021 in the processing pipeline. Including current year returns, as of May 15, 2021, we had 16.4 million unprocessed individual returns in the pipeline. Unprocessed returns include those requiring correction to the Recovery Rebate Credit amount or validation of 2019 income used to figure the Earned Income Tax Credit (EITC) and Additional Child Tax Credit (ACTC). This work does not require us to correspond with taxpayers but does require special handling by an IRS employee so, in these instances, it is taking the IRS more than 21 days to issue any related refund. If, as a result, a correction is made to any RRC, EITC or ACTC claimed on the return, the IRS will send taxpayers an explanation. Taxpayers are encouraged to continue to check Where’s My Refund? for their personalized refund status and can review Tax Season Refund Frequently Asked Questions.
The IRS knows that your stimulus check was sent to you so they will adjust the 2020 federal tax return that you filed and remove the Recovery Rebate Credit from the tax return. This will decrease your federal tax refund or increase the amount of taxes owed.
Is it a check for the new 3rd 1,400 Stimulus payment? That doesn't go on your 2020 return. Only the first 2 rounds are reconciled on your return.
So you didn't get the first one last April or spring 2020?
Or the second one that came Dec - Feb?