Bug or i don't understand

I am playing a magus- Holy swordsman. There is an ability “circumspect defense”. It must give defense bonus for intelligence. And i have height intelligence, but i don’t see any defense changes. Do I understand it correct or not?

Do you mean this, for the Sword Saint :

Canny Defense
When wearing light or no armor, wielding his chosen weapon, and not using a shield, a sword saint adds 1 point of Intelligence bonus (if any) per magus class level as a dodge bonus to her Armor Class. If a sword saint is caught flat-footed or otherwise denied her Dexterity bonus, she also loses this bonus.

My theory would be either
a) maybe you do not follow one of those conditions (light armor max, no shield)
b) maybe your are low level
c) sometimes bonuses show up only in the combat log or have to be toggle on with a skill icon.

Some also say the bonus applies after reloading the game.

Thank you for answer.

Did you manage to make it work ?
It could also be bugged.

Yes? i did. I reinstalled the game, I suppose it helped me.