My wife exclaimed... "the window is leaking! the window is leaking!". So I looked at it and tried to figure it out. The window is about 76"x36" with a 10"x36" transum window on top. I was surprised to find that top window is not securely mounted in place. I'm able to slide it up about 0.5" and see through cracks on the side to outside. Do you think the water might be coming through this way? I check a few other transum windows in the house and they all seem to be loose. Is this normally how the window is installed? Is there something I can do to seal the window better.