I don't know the answer to your problem, but as a viewer of your image, that hair "shadow" doesn't look like a shadow to me. It looks like an entirely different hair style than the one the figure is wearing, not to mention the placement of it in relation to the figure.  Are you sure you don't have a second hair prop/figure in the scene?

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi