Subtitled/Dubbed series in two different folders (intentionally) but show up stacked/versions

@JuiceWSA said:
A potential and persistent Plex issue with your MP4 file exists, however…

If Plex keeps borking your match, edits and Splits it is due to the default location of Local Media Assets and the embedded and bogus Title Field of that (and any) MP4 file. Plex will read this info and prefer it over a perfect file name/structure annihilating all your hard work so far, but you can combat that situation by moving Local Media Assets to the bottom of every agent list you can find. All tabs in TV Shows and Movies here:
https://support.plex.tv/hc/en-us/articles/200241558-Agents
Just drag LMA to the bottom of the list and drop it. If you do have embedded metadata this will cure the issue, if you don’t it won’t matter. LMA will do what it has to from the bottom.

Renaming/restructuring/fiddling is best performed OUTSIDE the library and you may need to write a new bundle for the show or movie so The Plex Dance® was invented:

The Plex Dance®:

  1. remove show/movie from library
  2. rescan library files
  3. empty trash
  4. clean bundles
    https://support.plex.tv/hc/en-us/articles/200392106-Library-Actions <— scan library files, empty trash, clean bundles
  5. bring names and structures into compliance/Move LMA/etc
  6. replace corrected show/movie into library
  7. rescan library files
    and in your case…
  8. re-split, edit, etc…

All Steps. In Order. No Shortcuts.

If the above problem occurs on the next library scan, repeat all the steps above AFTER you have lowered the priority of Local Media Assets and all should be fine.

Take note of this @Elhazred. It’s sound advice.