There is a visual bug with terrain where there are two different versions of the terrain at steep corners such as at the base of a cliff or next to the river which it swaps between when you use the zoom feature, I noticed the version of the terrain when you are zoomed in seems to represent the real terrain as it's how your character interacts with it and aligns with the fences along the river. This also leads to being able to look through the map while not zoomed in at some spots.