There are several sources that could affect the Schedule P line 9 entry you're seeing.
According to Line 9 – Adjusted gain or loss in the 2023 Instructions for Schedule P (540):
You will have an entry on this line only if you reported a gain or loss on California Schedule D (540), California Capital Gain or Loss Adjustment, or Schedule D-1, federal Schedule D, federal Form 4797, or federal Form 4684, Casualties and Theft, for income producing property that has a different basis for AMT than for regular tax.
The difference you're seeing could be attributable to computations on any of these forms. See the Instructions and calculation guidance for more information.
