The centre of gravity stays low thanks to the engine, batteries and fuel tank, but the centre of buoyancy moves with the boat’s angle, because different parts of the hull end up underwater. Upright, weight and buoyancy act on the same vertical line and the boat sits steady.
Roll it over and the centre of gravity doesn’t move, but the centre of buoyancy does. Fully inverted, the buoyant foam-filled cabin does most of the submerging while the lower hull sticks out of the water. The two forces no longer share a vertical line, and the resulting twisting force tends to rotate the boat back upright.
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