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You're looking at a two dimensional shadow of the 3D reality. The roof drops off too fast and the air along the sides rises and rolls over that sharp edge and the inward/downward rotation reattaches the flow.
The template is a 50% truncation. With geodesic domes based on the icosadehron popular truncations are 3/8ths and 5/8ths. 3/8ths has maximum floor area for volume and high aerodynamic lift. 5/8ths has more volume for floor area; but (allowing for the difference in cross-section, or not?) is less susceptible to lift. Above and below the equator balance each other out.
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