Im not sure what you mean by when you look down on it? LOD are calculated based on the screen space the mesh takes up. Here is a thread that might help you - Changing LOD distances? LODs and foliage?
When you look from the top, i assume the mesh takes a very very small space, so it switches to the lowest LOD. This is just a speculation though.
Try messing with the settings and see if it fixes it, there was someone who mentioned that reimporting the mesh also fixed some issues!
Best of luck!
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