If the IRS adjusted your Refund, they will send you a letter telling you why they did so.
Wait until you receive that letter before amending your return, as you may not need to amend.
$600 sounds like the amount of the second stimulus payment. If you claimed a Recovery Rebate Credit on your original return, they are checking the credit against their records of payments sent out.
Click this link for more info on Why Was my Refund Adjusted After Claiming Recovery Rebate Credit?
Click this link for instructions on How to Undo an Amendment.
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