Toni, some banners go across the whole screen, and others only go about 3/4 of the way and start over again with the beginning of the left side. I don't think this happens for everyone, but when it does it is disconcerting. I think it has something to do with the size of your submittal and/or the size of the screen it is being displayed on. My main screen is 24".
There have been some discussions about this but I forget what the consensus was and I suck at searching. Maybe someone else remembers or can find the thread(s) that addressed this.
Nevertheless, you banner is quite lovely.