[LibreELEC 8.2.5 running on Generic.x86_x64]
Noted that some movies did not appear in the lists; all such movies were behind a folder named "=" (just an equal sign).
Changed that folder's name to "[ ]" to test and all missing movies now appear in the lists.
Seems that either Kodi / LibreELEC don't like that name even though it's a legal one.