THe hopping mobs are because of the waypoints in their path. Two waypoints create a straight line for the mob to follow - not just in direction but also in elevation.
If you have two hills and a dip in between and place two waypoints at the top of the hills, the mob will end up hopping. Each "step" the mob will not only move forward but also move upward to the point directly between the two waypoints.
easy to solve (as pointed out to me in a different thread). Place a waypoint at the top of one hill and the next waypoint at the bottom of the hill; a third waypoint at the bottom of the next hill and a fourth at the top. THe mob will then follow the terrain properly.
I also find it handy to edit the waypoints manually and lower the Z coord a bit in areas where there are slight or difficult to see elevation changes (everfrost newbie area - all white makes it hard to see).
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