Base Stat: Armor

[IcarNS]

I'm playing a prot warrior and I have a question. I've always seen that when I check my armor stat in the character window, I see it is reduced 663. The tooltip states: 34007 (34956 -663). Also, the substraction is wrong...
Why does that happen?

[SabDK]

A kind of similar thing happens to my ret paladin with berserking enchant on the weapon. After the first proc, the armor value will show up in a red color whenever I open my character window. Even if the berserking proc isn't active, it stays like that until I relog.