There is some sort of UI bug with posters on both my Apple TV 4 and my Apple TV 4K. This only happens via the Apple TV's...not via the web portal or my iPhone X. Look at the outline around the cases on some of these...
Apple TV 4K screenshot taken via Xcode:
Some of those same collections look fine via the web:
Edited by jrcorwin, 27 December 2017 - 12:32 AM.