Synology DMS showing wrong version of Plex



I intalled and this is what the Plex web interface shows.




However the Synology interface shows Why?




Most probably because your first install of Plex was using Synology's default package and you used Plex team's package to manually install a later version.

If you had it installed manually, it wouldn't appear in the "multimedia" section. Now, it might be a visual bug, but I guess that's on the synology side and you Plex is just fine as long as it display the version you installed last.