Embedded maps commonly do not display readably, usually the center of the map (see screenshot), occasionally all of it. Changing the zoom level of the map doesn't help as the scrambled area resizes wih the map. The same appearance can occur (?randomly) with other graphics, seems more likely if they are animated. I am unable to upload a screenshot from his page, but the "scrambled" area looks like an analog TV with incorrect horizontal hold from back in the day - i.e. horizontal "smearing" of the image (raster) lines.