Okay seriously... how did he see me???

[GraphicsKid]

I've got a part in my level where you're hiding in a jail cell and there's a monster patrolling around... I'm in COMPLETE darkness (player info says 0.0 for both ext and normal lighting (whatever that means), and I'm crouched down, and the monster spots me for like a split second, loses me, then goes wandering off in a random direction. It's really irritating because it seems like whenever it sees me, that's messing up it's patrol nodes... which would be fine if A) it didn't lose me immediately, and B) there was a good REASON it saw me.

EDIT: Oh and it's just the narrow jail bars, but I've also put up those invisible pink boxes to block vision (does that work?) It's not stopping the monster from seeing me.