Trying to Amend 2021 Taxes and taxes applied have changed?

IRS sent me letter stating that our AGI was $10 more than what qualified income was for Stimulus Rebate...and requested payment back for the  $2800 (Stimulas payments)plus penalties. Turbo Tax apparently calculate incorrectly and showed our AGI as 150,010..$10 over to claim stimulus payment.  IRS said that Turbo tax shouldn't have allowed the Stimulus since our AGI was over $150,000 by $10.    I amended my AGI by lowering it below the $150,000 with a business deduction only and now it shows that we owe more taxes? I only entered a business deduction of $225 that we failed to enter, nothing else, which lowered the AGI under the $150,000 but it shows that we now owe an additional $ 988?  Why would this be?  

So frustrating.  The AMENDED calculated 2021 taxes increased on the LOWER  AGI  ..when only a $225 deduction was entered.  Could this be another Turbo Tax error?  

Should I go have my taxes amended by a professional?  Why would my taxes increase for adding a business deduction of $225 only?