Hello MissCast,
do you have the iOS version or Mac version?
Just to clarify, the styles that appear in the Editor are different from the actual named styles the player has as playback options. The latter are grouped, Jazz, Latin, Pop, Blues. The ones you see in song INFO > Styles (listing in the Editor) list in alphabetical order, a dynamic list from all songs and what has been used in their INFO > Styles. This is what you see top left on any chart. They may not necessarily correspond to any actual style selected for playback.
Information here:
https://technimo.helpshift.com/a/ireal-pro/?s=player&f=accompaniment-styles-vs-style-indicator&l=en
The reason why you had to import a song tagged with Jazz - Swing Two/Four, is because no other song in your library would have had Swing Two/Four (in any song's INFO > Styles). (Importing a song with this style is not necessary, there is a Custom option (or just type in the Mac version) in INFO > Styles, where you type in anything you wish, (e.g. typing in "Swing Two Four" should select that actual playback style after saving.) Thereafter, this choice should list in the Editor, INFO > Styles unless you have edited all songs with that style and changed all to any other style.
Even if you have no songs in your library tagged with a certain style, all the playback styles the player can play will still list in the 4 categories (jazz, latin...) in the Player controls (bottom menu iOS).
Does this help explain, (if I understood your question correctly)?
Thank you