I’m not sure why Kwikset did this but the strike plate included with their 816 deadbolt doesn’t come with screws that are flush when installed. This becomes a problem in older buildings where the doors are installed with very little room between the door and frame. Since the screws aren’t flush, when the door is shut the screws will scratch the door, or you may not be able to shut the door at all.
In order to avoid this problem you must mortise the strike plate in farther than flush with the surface.