I suspect that’s the product of (1) the slight curvature of the hand (resulting in a different reflection from elsewhere in the room), (2) the extremely shallow depth of field, placing the edge out of focus, (3) some artifact in the software, or all three...
Even with a good lens, I didn't think it was possible to see that much gap between the dial and the hand. And captured with its shadow too! But Lange does make your photography easier : )