This is just a wild guess here, but are objects and such in the map files? Like a broken table or pot sitting on the ground... Perhaps some sort of item like this is in the way causing it to not see you? And as for the aggros. perhaps the geometry in the zone is somewhat poor and there's a small "seam" between two walls or such?
again, far fetched. Admittedly i don't know what I'm talking about. =)
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