I may be misunderstanding, but I think it’s one of two causes:
1. You set a song for scene A and a song for scene B. The song for scene B is playing. The song for scene A will not begin playing until you begin to actually play in scene A (like moving the character around.)
2. Scene A is set to <continue last song> (Sorry, I can’t remember the actual name) and it’s just continuing to play.
It might be easier to work this out over Discord, since it’s easy to send screenshots there. Please let us know if the problem continues to persist; it could be a bug. Best of luck! 😀