iPhone 5s corrupted display

Using official ios app on iPhone 5s (dedicated remote) the display isn’t right.

This doesn’t happen on iPhone 6

Also I didn’t get a response as to why the app shows “demo” in the bottom right corner?

The app showing demo is nothing nasty, just it’s set in demo mode (for complicated reasons, but those won’t affect its functionalities in any way).
As for iphone layout, we have a new iOs app in the works, that shoul solve it.
Thanks for your reports