Per the IRS:
If your refund amount is different than you expected, it may be because we made changes to your tax return including corrections to any Recovery Rebate Credit or Child Tax Credit amounts. Also, all or part of your refund may have been used (offset) to pay off past-due tax or debts. Refer to the FAQs below:
Tax Season Refund Frequently Asked Questions | Internal Revenue Service (irs.gov)
