Could it be the screen protector perhaps? There is a screen protector fitted to the touch screen from the factory, and maybe it's been damaged by cleaning products or wasn't applied correctly or ?
Whatever it is, the dealership should be consulted. If they give you the "that's normal" or "they all do that" story, make them show you the same problem on any of the other new bikes in their inventory. If you did something yourself to damage the protector, a new one is almost $60 MSRP from Harley. For that price you could probably find something better elsewhere, like Zagg or the other high end protectors offered for phones, tablets, auto systems, etc. I imagine some of the guys will jump in with suggestions from their own experiences.
Jerry