I have two movies for which I have added the Label "Oldies." None of my music carries a genre of "Oldies."
When I type "Oldies" into the Search field on the Plex Web home page, this is the result:
I can see why it picked the Tracks that it did, since the search is designed to be a little "fuzzy" for spelling errors. But I see no reason why it lists the "Oldies in Popular Music" under Genres (where there are none), and I see no reason why it doesn't list Oldies in Movies (where there are two).
If I click on the Oldies in Popular Music item, it reports "There is no content matching your active filter." This proves that the Quick Search is in error.
PMS Version 1.0.3.2461
Plex Web 2.7.8