It may be overlapping data blocks. Could I have copies of your EPG Plex Media Server databases ?
Location would be same directory as that where the main database is
see https://support.plex.tv/articles/202915258-where-is-the-plex-media-server-data-directory-located/
The subdirectory is Plug-in Support\Databases
There are 3 files to copy out - all with names starting tv.plex.providers.epg.cloud- and with filename suffixes of db db-wal and db-shm
Copy these out and zip and send me the zip by private message
