Ah. That's the hang of the axe. That's mostly going to affect the height at which the axe will naturally land square when swung. An "open" hang like that would be best suited to striking near the ground. Many hewing axes and "turf axes" --which were used for chopping blocks of sod-- were hung open like that because of the near-ground-level blows they routinely delivered. The higher the blows you're delivering the more closed the hang needs to be to land square with a natural stroke. This also works on a similar fashion with horizontal strokes when doing things like limbing.