The reason your photo would show up on the website and not on the app is because of Apple’s strict content policy. We don’t allow any photo to appear on the app without being approved by our moderators (a ragtag team of indentured Oompa Loompas). Sometimes this can result in a delay, where your photo appears on the website, but not in the app. Rest assured, as soon as your photo is approved, you’ll see it up there in the app!
If the photo is tagged as safe for our website, but not for the app, then the photo will only appear on our site, and in the app it will tell the viewer that they can only view that photo on our website.
Hope this helps to clarify,
The Grokio Team