What? How did you even increase it? For me it always showed 87 even after receiving the +10, however the correct amount was shown when showing the possibility of victory, like enemy has 120 and I had 137 which was like 70% win chance.
Another thing I noticed btw is that the amagal replay fights still give the original rewards unlike what the loot table says (like the amagal barracks fight should give AP potions if you replay the fight but it still gives either great medium or heavy armor), begus replay fights do change the reward so I'm wondering if that's a bug.