Only half of my playlist downloads

[TranceMusic]

Got a new phone and downloaded one my playlists (365 songs). It seemed like it downloaded normally but a week later I noticed Spotify had used up nearly 1 GB of data. Since I only listen to my downloaded playlist, I thought this was weird. Apparently, only about half the songs in my playlist had downloaded. There is plenty of empty storage on my phone. I downloaded the playlist again, and even less of the songs downloaded this time around. What's going on? I've nearly gone over my data limit this month.