3rd Stimulus, $2800 received last March

Last year my wife and I got a 3rd Stimulus check. We have no kids mind you. Any way, at the end of figuring up my Federal taxes on TT Deluxe, the question is asked if we got the check. We said yes, and then TT added $2800 we have to pay in Federal taxes. I looked online and read that this is non-reported and you don't have to pay it back. So what is going on??? I have not received letter 6475 from the IRS yet, but what can that change? Did anyone else have $2800 (or $1400) suddenly added to what they owe?