Sounds like you failed to include the $1,400.00 on the Tax year 2021 tax return. There is a question that asked you if you received the $1,400.00 and if you put $0 then it was calculated as a part of your expected refund.
When IRS received the return, they matched the information and found that you had received the Third Stimulus and therefore reduced your expected refund.
As this is speculation based on your question. the IRS will follow-up with a Explanation of Adjustment Notice in a few weeks.
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