Defensive Fighting

[siegelayer]

I have a character with Imp. Two-weap. Defense and Combat Expertise... I'm pretty positive that it did not do this before, until I leveled to lvl 21 or 22, taking my 5th level of Champion of the Wild. Now when I use Combat Expert it adds 3 ac, then the event log says something like "Defensive fighting enabled with two-weapon defense" and adds another 4 ac, for a total of 7 ac from CE.

I have no idea what defensive fighting is, even. I guess it should double the ac from TWD feats, but this would be tripling it, I believe.

[Kaedrin]

Combat Experience is +3
Imp Two-Weapon Defense is +2
Defensive Bonus for Imp Two-Weapon Defense is +2

You get the same bonus with Parry and Imp. Combat Expertise.

PnP two-weapon defense feats provide double the protection while you are fighting defensively which effectively gives them a comparable ac to a shield user.

[siegelayer]

But mine is:

ITWD - unarmed/buffed ac = 48

Weapons on, ac = 50

CE on, adds 3 ac, then adds another 4 ac, for 7 total. ac = 57

Does the same on another build of mine too. doubles the TWD ac and then adds the doubled amount onto the pre-existing ac benefit, in effect tripling it.