RasPlex is not maintained since 2017. Do not use it! What do you want to accomplish? Convert your Raspberry Pi OS setup into a Plex media player?
When using any RPi as media player, please always install LibreELEC and setup the Plex Kodi plugin.
Everything you need to know about using a RPi as Plex server is summarized here: READ ME FIRST: About Server ARMv7 and ARMv8 Ubuntu / Debian
Btw: whenever you utilize any VPN service on your RPi, not matching meta data is mostly because of that.
