I noticed the same on Madora.
Her character stats are reporting 9 AP. I think it is a bug, but not reliant on constitution applying a hidden modifier.
[EDIT: See Sword below]The "What a Rush" talent gives +2 AP. Madora would normally have 7 AP. I'm guessing that this extra AP is somehow just not being reverted once she has more than 30% health. Maybe when "Comeback Kid" initiates and Madora escapes death the "What a Rush" talent doesn't end after she is healed past 30%?
[/EDIT]
[Edit:Sword] I went back to an early savegame and checked Madora. She has 6 speed and reports 6 AP in stats, so all normal. Until I equip or re-equip a greatsword called "Salved Old Executioner's Sword of the Geomancer" then her AP turns light blue and is increased to 8.
Other swords do not have this effect. There is another, subsequent, savegame that has Madora's AP stat as a permanent 8 even though there has been no actual in-game event that would do this to my knowledge.
I may be able to replicate this bug as the time stamp between temporary increase in AP and permanent increase in AP is about 3 hours in-game or :30 minutes +/- real time. I'm still betting on "Comeback Kid" triggering this permanence effect as the save just before the AP becomes permanent is pre-rescue of an Archeologist. Madora may have been reduced to near death during that event.
Giving this theory a go.
[/Edit:Sword]
I'm having the same "bug" with Madora. But for me its the armor instead of sword. Like you i thought "What a Rush" is the culprit and i tried unequipping and equipping but i still get 9AP instead of 7AP. I then saved and reloaded it went back to 7AP, but when i took of the armor and wear it again, it went back to 9AP. I tried with different armor with similar stats but only that specific armor managed to bring me to 9AP, i cannot find any explanation.
