Yes using iOS!
I will try again today and let you know. I clicked show private key, but it looked like the QR code did not change. It also may have picked up the QR code of the one above or below as I could only get it to read when I was about 12-18 inches away from the screen!
Not running the latest version of iOS (currently 10.0.2).
I figured the slider was definitely just user error.
I love the typographical emphasis and other options when replying!