Nike custom workout plays the wrong playlist

Hey there!

I have created a few custom Nike+ workouts (distance and playlists can be set in advance)

I tried to use one of my custom workouts for the first time, but the song it started playing wasn't from the preselected playlist, it was from the last playlist (alphabetically) on my iPhone.

I removed the playlist from my iPhone and created new custom workouts, but it just went to the new last playlist on the iPhone, and not the playlist I chose when creating the workout.

Anyone else having this issue?

Thanks,
Alirio