It does this when you upload the images and then use the attach tag to insert the images in your post (paperclip icon). If you don't use the attach tag, it show the attached files just fine.
This seems to be a new bug that just started in the last day or so. The same thing happened to my post here:
https://forum.oneclickchicks.com/sho...postcount=9813
Here is an image inserted using the attached tag:
Screenshot2.jpg
And, I'll upload another image without attaching it, and it will show up in the box below: