What happens is that your theme displays post meta (some meta data that you can add to your post). Easy Photo Album uses post meta data to store the images in the album and your album settings. So when you view an album in ‘single’ view (like https://arlingtonlodge.org/albums/4th-of-july/), your theme “sees” the post meta and displays it. The other pages with albums don’t have that problem because you use the shortcode there. A page with the epa shortcode doesn’t has post meta data from Easy Photo Album because that data belongs to the album, not the page. So your theme doesn’t “see” any data, so it displays nothing.
Maybe it is a theme option to display post meta. You should contact the theme developer to ask how to get rid of displaying post meta data.