Ah, thanks for sharing. I just did a manual override to the apportionment percentage without having to change any reporting. For future searchers, more information is found here: https://revenuefiles.delaware.gov/2023/CIT-TAX_2023-01_Instructions.pdf . Seem like there is an issue with the formula within the software. Here is an additional link to apportionment computations across states: https://taxadmin.org/wp-content/uploads/resources/tax_rates/apport.pdf .
