Lookback calculated wrong for eic?

I have been told by the IRS that they have adjusted my EIC amount to reflect the lookback credit and my refund has been reduced by about 1000 dollars. My 2020 return utilized the lookback to calculate a bigger actc credit but still used my 2020 EIC as it was bigger. According to the account specialist at the IRS they have fixed my EIC to match my 2019 agi and thus my refund has been reduced and I will get a notice in the mail.

 

From what I am reading its allowed to use the lookback for one and not the other, so why has the IRS adjusted my eic to reflect 2019s agi?