This topic was raised a while back here. I am experiencing the same thing now with both my (old'ish) Samsung display as well as via my Android TV box. When comparing two series broadcasts, namely The Terminal List vs The Ring Of Power, the first seems to broadcast in UHD while the latter in HD - even though their title pages (with all the information) show that they are both available in UHD. Not only do I see the difference, it becomes apparent when you pause, rewind, or forward. From the above link it is apparent that others have the same issue. Is this something that is linked to the hardware on which the app runs, or is there another explanation?