Perhaps a Proseries user could help by doing a dummy run of an initial year CA corp to see if the $800 pops up.  If so, software problem.  If NOT, there may be an override field (like for Lacerte) and you had an entry there.

Another possibility: Check the incorporation date.  Perhaps a year before 2023 was entered and Proseries ignored the entry (check box??) for "initial year" and used the incorporation year as entered.  Lacerte goes by the check box and ignores the incorporation year. Just a thought. 

Computer software generally behaves predictably.  That said, the above is all I could think of. 

When all fails, override the tax with zero.  CA has indeed waived the $800 min tax for a corporation's initial year..