Well, there is definitely enough information and details in this post to quickly and accurately find and fix the problem. Well done sir.
Apparently your the kind of person who need to get more information for simple thing like we kill mobs and dont geting xp ;p
Let me help with some specific questions then. What server? What NPCs in particular" Which GD (assuming you mean Great Divide)? There are at least two of these.
Gorul Longshanks exists in both Scars of Velious and Torment of Velious ... which expansion are you supposedly not getting exp.