TurboTax has no way to know that you received that stimulus check. Only you and the IRS know if you received the stimulus check. Since you answered "no", the software correctly added a recovery rebate credit to your return and increased your refund. Then you received the stimulus check that you told TT you did not receive. When the IRS processed your return, they knew you had received it, and they reduced your refund. You cannot get the same stimulus money twice.
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