Wiper swipes onto Windshield Frame

[Colonel]

Have a vacuum wiper on my slant windshield sedan. It works very well but the swipe of the blade travels onto the windshield frame and when it returns ends up a bit on top of the windshield frame also. I verified with others that I have the correct arm and blade. Is there an adjustment I can make to keep the wiper blade on the windshield as it goes through its cycle or... is this normal?