Yeah, it does appear that the head tube is lined up with the back edge of the fork blades, rather than an imaginary line down the middle of the blades. But as T-Mar said, camera angle and distance / focal length creates perspective distortion. It would help to stand directly to the right of the head tube / fork, rather than at the "middle" of the bike. If your camera has an optical zoom, standing back and zooming in would help as well.