I haven't seen this before! For us to figure out what's happening, please let us know which Aura it is so we can check it out on our system. You can let us know by posting a share link to your Aura, the name of your channel, or tell us your Dev Studio username, and which overlay/aura it is. If you'd rather not post that info on the forum, please email email@example.com
Also, please let us know which device you are using, and if possible, which version of Aurasma you are running.