In the app, when you first post, it shows up twice but then goes away. If you attach more than one image, they are all together at the bottom. I saw it as a "this is your message and these are your attachments" kind of thing.
A few days ago the app was updated. You may need to refresh or cycle your device off and on to sort this out. I've seen several reports about this issue but in each instance only one image actually displays in a post..