From what I am seeing does not look like the shape of the hair you are using. Try this: with out the figure in the scene does the "shadow" show up? If it does not just load the figure and see if it shows up then. Also can you change the position of the door opening? Try it and a great value for open and see if the "shadow" shows. Another thing to try is changing the angle of the lights to see if it still there. What it actually looks like it is a caused by something you cannot see in the scene maybe.

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