All lists default to downloaded music after first song

[DaDavid]

I downloaded albums to listen on a plane, but now my lists all default to the downloaded music after the first song.  For example, using a playlist I created, I went to the "radio playlist" to find similar songs.  The new songs populated the list, but after I start playing the first, the list switches and all the songs after the first change to a Van Morrison album I downloaded.  This also happened when I tried to listen to my Starred songs -- I see them all, hit play on the first, and "boom" Van Morrison songs take over the list.  Weird.  Any ideas on how to fix this?  I tried deleting the downloaded VM album but it was not apparent how to delete downloaded music.  Many thanks for any help.