your tax withheld is 1040-X line 12
your estimated tax is 1040-X line 13
you are just moving the estimated amount to line 13.
line 18 does the work - your refund is not as filed but as adjusted by IRS and is too large.
That gives you an "amount you owe" to send back to IRS.
If you do it be sure your payment is marked as "for 2021 1040-X"
In Part III explain that the error is from your tax preparer, not you.
@Flex2009GO
Amended returns are taking 10 months to process but the IRS backlog is coming down.
