The Recovery Rebate credit in the amount of $1400 was an amount that was included on line 30 of your 1040 tax return. This effectively increased the amount of your refund when you filed the return by $1400. You should only have received this recovery rebate credit if you had not already received the third stimulus check.
There were questions in the federal review area of the interview on Turbo Tax that asked if you had already received the third stimulus payment of $1400. This third stimulus was sent out to you between March and May 2021 and you should have received letter 6475 from the IRS informing you of this. In this area of the interview on Turbo tax, you were asked if you already received the $1400 and were to indicate yes or no.
If you received a letter from the IRS adjusting the amount of your refund by $1400 , it is because their records indicate that you already received this third stimulus.
I suggest looking back through your bank records for deposits from the IRS for $1400 between March and May 2021 and also creating an account on IRS.gov where you can see what they have in their records for what was sent and when.
I have included a link with more information on this:
https://www.irs.gov/newsroom/letters-about-third-round-of-economic-impact-payments-issued-important-...
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