IMAGE2011 is the basemap of the webmap. The other 3 I added. If I don't add the Basemap Gallery widget to the app, the IMAGE2011 basemap from the webmap does display when the app starts. If I add the Basemap Gallery widget, no basemap displays when the app first starts, unless you then pick one from the gallery.
From help, "If the basemap used in the web map is not included during the configuration, it will be automatically added when the widget opens."