Add two light weapons to a character with Power Attack. Equip one weapon as primary and one as off-hand. In the temp bonuses tab, add Power Attack (Light) for both weapons, and add Power Attack (Off-Hand) for both weapons. Observer the character sheet statblock preview to see that there are Power Attack weapons listed for both weapons for both hands. Save the character and close it. Reopen the character and go to the temp bonuses tab. One of the 4 Power Attack temp bonuses is missing.
Saving has nothing to do with content. Moving to code.
Might be code or might be data, related to the wieldcategory part after the “;” in the type field. Once you load the file, one is missing, but you can’t add back the missing one because the UI says it’s already there, when it isn't. Or might be both.