That amount of refund change (1800) seems to indicate your original refund included stimulus payments (1200 and 600) that were added to your tax return on line 30 as a Recovery Rebate Credit.
If the IRS has a record that you were already paid those amounts then they would have corrected your return to subtract that credit.
You should get another letter explaining those Recovery Rebate Credit changes. Here is a link with more information on Recovery Rebate Credit amount changes. See question G5.
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