The problem might be because the deduction was only $300 in prior years for a married return? My single return shows the $300 fine.
"However, the CARES Act authorized a deduction of up to $300 for monetary donations made by non-itemizers during 2020. Then the Consolidated Appropriations Act (CAA) extended this tax break to 2021 and doubled the limit to $600 for joint filers."
Perhaps there is just a bug here because the program isn't managing the joint filer status. Last year status didn't matter.
