I have a problem, namely when I put a record in Minecraft that I hear the music everywhere (same with / playsound).
Minecraft Java 1.16.5 Server Craftbukkit 1.16.5 Plugins Worldedit, Worldguard, ForcePack, ServerRestorer
Since you have ForcePack on it, I assume that you added your own music. The .ogg files must be mono.