There appears to be a glitch in the Roku app in the Live TV & DVR interface. When there is a failure in scheduling a recording of a movie or show, the poster/image for the movie will remain on the screen even after you navigate to a different section.
To get rid of it you need to close and reopen the Plex app.
I have seen this on my Roku TV, and my Roku Ultra
Roku TV A108X, TCL model 65R625, running Roku OS 10.0.0 build 4197-88
Plex app 6.7 verision,build 26
Roku Ultra 4670X, Running OS 10.0.0 build 4195-46,
Plex app version 6.7
I have been able to recreate this several times, and can share a picture if helpful.
Thank you.