ah man, so sorry about that! all the tracks were from pixabay as royalty-free, but youtube’s content id system is notoriously annoying with those.
i actually have the official pixabay license certificate for the track! if you want to submit a quick dispute in youtube studio, i can send you the license details to get it cleared up right away.
i’m also pushing a hotfix right now to replace that track with a 100% safe one so nobody else runs into this. really appreciate you letting me know!