The EPG normally covers about 2 weeks schedules and that would be the period for which airings would be checked
In rare cases the Gracenote data may change the identifiers for the SHOW / SERIES - if this happens then one would need to reschedule at the Show level
Would need some diagnostics to check this out.
- The details outlined in this forum post Reporting Plex DVR Lineup Inaccuracies - Live TV & DVR - Plex Forum
Also to see what is scheduled you can make these http requests to the server in a browser and copy the responses to text files, and zip and attach
http://192.168.1.228:32400/media/subscriptions?X-Plex-Token=xxxxxxxxxxxx
http://192.168.1.228:32400/media/subscriptions/scheduled?X-Plex-Token=xxxxxxxxxxxx
You would need to find the server security token and substitute it for the xxxxxxxxxx in each of the 2 requests to try
You can get the token from the PlexOnlineToken in the Preferences.xml file or follow the steps here Finding an authentication token / X-Plex-Token | Plex Support
