This occurs in (at least):
Plexamp 4.2.1 (Linux AppImage)
Plex Web 4.80.0
Android TV 9.2.0.32364
I entered the term ‘night’ in the Search field. The ‘top 3’ results from Plexamp are in the screenshot below. For the two circled tracks, their only connection with the search term is that they come from an album whose title matches the search term. As you can see, that album is correctly listed in the ‘Albums’ section. I also found tracks in the results that only match because the Artist’s title matched the search term.
I think track results should be limited to tracks where the track title matches the search term. Otherwise, why have separate sections in the search results for tracks and albums?