Hi Burr, it looks like your CAM package is taking the center of the underlying surface as the spot for displaying the normal.
In MoI, select that face and do an Edit > Separate to break it off of the main object, and then use Edit > Show pts to turn on control points and you will see that underlying surface is a kind of slanted parallelogram, the visible part is half of the underlying surface and the centroid point of the underlying surface is in that spot that you indicate.
That surface probably started out as a longer piece and the current one you see is the result of some other trimming or booleans that cut it in half diagonally.
- Michael
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