Fluorite like you're showing there has been pretty much the same since the game got released.
No need to worry since these spots look the same for everyone where there's no meshes placed. The decision of this is not fully known however, whether it be due to time restraints before the game was released, considered too demanding for the map itself and meshes had to be cut down on or whatever the reason might be.
Does give off an odd feel but not much that can be done about it at this point in time, and your game is all fine and dandy.