Guild Wars 2

When I’m out fighting, I have 3048 armor, when I’m in combat I have 2948 armor. No conditions, no debufs. It happens very often, can someone explain to me what happen here. Invisible debuf or what ?

Screens:

Out of combat
http://img842.imageshack.us/img842/5568/gw334y.jpg

In combat
http://img233.imageshack.us/img233/6296/gw335.jpg

do you have 5 points in defence? see that minor trait

you dip below 90% hp.

In other words, defense mastery blows balls. Unless they buff Hammer.

kitai.7638:

do you have 5 points in defence? see that minor trait

oh, it is, thanks for explain