Itunes no longer syncs playlists to iPhone

EDIT: I fixed this issue by deleting the Music app from my phone and then reinstaling and then resyncing to iTunes (sorry, could not see how to delete post).

A couple weeks ago, after an iOS update on my iPhone 6s, itunes will no longer synce *most* of my playlists. However, when my phone is plugged in, iTunes shows all the playlists existing on my phone. But when I try to play them through the music app on my phone, they are not listed. Everything has the latest updates. Anyone else experiencing this? Or, more importantly, know how to fix it???