Bug: iOS next song in lock mode plays song from other library

HI,

this is happening:
I have two libraries, one with my songs. and one with my child’s songs.

When my iPhone is locked and I click on next song, the next song will be exclusively be a children’s song.

This behavior doesn’t heal on unlock (“next song” not from my library but from my child’s) only when I manually click on a song from my library.

I can gladly provide more info if necessary.

btw: not sure where to submit a bug so I used this form.