I don't know how it is supposed to look but I would guess it's margin issues. If it is supposed to be a solid thin line across the top, similar to the way it is towards the left and right of the top, I would guess that the sum of the left and right margins (e.g., Left 40 and right 20 = 60) is too big for the source image and one of them needs to be a little smaller.
If it's supposed to have a gap in it, then I'd guess the left margin needs to be bigger.
Since the left and right sides of the top section don't appear to be stretching down, I'd guess the top margin is ok.
