It is a bug you might want to address but it probably won't affect most of your users.
I just got the Apple TV box today. When I was using it I had the sound on my soundbar turned off so I was testing and playing without sound.
Well after I posted I turned the sound on my soundbar. Alas, Apple TV started reading everything on the menu screens. I went into the Apple TV settings and found voiceover was turned on in accessibility. I turned this off and of course the voiceover went away. During this time you made your first post saying that the box was normal and I PM'd you. About 10 minutes later I went back into channels and the box outline had went away. I assumed you might have gotten my pm and fixed it.
Then you replied to my PM, so I went back into accessibility and reenabled voiceover and the White info outline remains. LOL. So this is definitely an app issue but one that I just accidently happened upon. You might be able to duplicate this yourself.