I download the game for the Google Nexus 5X which is running pure android 6.0.1. There is an issue with how the API deals with cameras and many apps which read codes with the camera show up upside down. This makes it very difficult to scan in cards. Could you please patch the game and fix this issue for pure android customers.
In my research, it is hard to tell whether this is a Skylanders application issue with using an outdated API, or something with the phone settings. To do the easy test first, try going into the phones Settings -> Display and make sure Auto-rotate is checked. If it is, deselect and reselect it. I hope that helps.