No one can see the return you prepared. Tax year 2021 was a tricky one, and lots of people made mistakes. Many mistakes were made with the recovery rebate credit for the 2021 stimulus check or with the advance child tax credit. If you had amounts on lines 28 or 30 of the Form 1040, the IRS looked very closely to match the amounts you said you received with their own records of how much was sent. There was also a "lookback" for earned income credit that confused people. So it is not surprising that the IRS found a reason to reduce the refund that you were seeing on the return. They will send a letter explaining what they changed.
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