The addon tries to target mobs, who must spawn in another zones. For example:
http://pics.kz/i3/b3/45/b345b8e3d067d0f73c90506de29dd001.jpg
RareDar shows mob from Silverwood when i`m in Gloamwood.

Also, some coordinates wrong. Xaksha in Gloamwood spawns at 4450 x 2460, on the top of tower. Addon coordinates points in wrong place.