Title says it all.
I am trying to stack prefixes (staff, donator etc.), but it isn't working.
I have the latest PAPI extension (v4.1) and I don't quite know what the problem is.

If someone could let me know what I am doing wrong, that would be excellent.
Thanks,
@redstonedesigner

Isn't latest PAPI is 4.5.1? Or it's spigot thing again? :D
https://github.com/rojo8399/PlaceholderAPI/releases

It's not the PAPI version, it's the LP extension version.

And also, that's for SpongeAPI, not Spigot.

What placeholders are you using exactly and how have you got it set up in the LuckPerms config?

If you want the full config, let me know.

I'm trying to use %luckperms_prefix% in DeluxeChat.
Related config:

meta-formatting:
  prefix:
    format:
    - "highest_on_track_donator"
    - "highest_on_track_staff"
    - "highest_on_track_yt
    - "highest_on_track_dev"
    - "highest_on_track_builder"
    start-spacer: ""
    middle-spacer: " "
    end-spacer: ""
  suffix:
    format:
      - "highest"
    start-spacer: ""
    middle-spacer: " "
    end-spacer: ""

If you have vault installed, try just using %vault_prefix%

I tried that, but it doesn't stack them.
I was hoping for something like [Iron] [Mod] redstonedesigner

Make sure the player is apart of all the tracks.

diamond is part of the donator track and owner is part of the staff track.

I fixed it.
When adding the YT branch, I forgot a closing speech mark.
Thanks for your help.