It does appear that your 2020 Federal 1040 tax return was filed, accepted and the correct refund issued. Despite these facts, it appears that the IRS used 2019 tax information in computing your third stimulus payment.
This TurboTax Help states:
Do I need to do anything to get my stimulus check?
You don’t need to do anything to get your stimulus check. The IRS will determine eligibility based on your last tax return (either 2019 or 2020) and will likely send your payment to the bank account where your tax refund was deposited.
Since your 2020 Federal 1040 tax return was accepted, we do not know why the IRS issued a third stimulus payment using 2019 tax information. We do not know when or how the additional third stimulus amounts will be processed.
We presume that at some point, the updated 2020 Federal 1040 tax return information will be updated and payments issued but we do not know what the IRS plans to do. The IRS could, again, use the 2021 Federal 1040 tax return to reconcile the third stimulus payments.
Follow the TurboTax COVID Tax Center and the IRS Economic Impact Payment Information Center as further updates are issued by the IRS.
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