The issue today and yesterday could be the one caused by overlapping airing data and the old generic entry is showing up on Plex Web. Some client apps eg Plex for iOS and Plex for tvOS are resilient to some degree to the overlaps. It has been referred to our EPG team
If you never got any program data, then it could be something else and would like to see debug logs collected from the server 10 minutes after launch
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
