I've attached a zip file that contains a few files to fix the pathfinding issues in the Hillforts. This is what has been done in the next patch, but I see that some are having a lot of trouble with this, so I thought I'd provide the current 'fix'.
Extract or copy the two folders in this zip file to the 'root' RS2 'data' folder. They should ask permission to overwite files. If not, wrong place.
What these files change are the inner walls of the hillfort....changing them into 'buildings', in a sense, rather than wall files. They 'look' like walls, but actually are
a 'greek Stoa' that looks like a wall. The object of this was to widen the area on the sides of the 'walls' so that units can't get near them. My tests show that units no longer try to go thru them or even near them, because they perceive them now as objects that they can't go through. Units no longer go 'in between' the two inner walls around the settlement either, because the 'footprint' of the wall\building is too big to allow them to go there.
These psuedo-walls are also indestructible, as it was intended that the settlement had to be attacked through the gates on either end, and of course, units now cannot get up the seriously steep sides of the settlement.