Here's another. I did the reverse.
It seems sporadic. It started adding songs from an added album and when I checked it had in fact only added the first song. I ran the sync again, and it added the second song, and that was it. There are about 16 songs on the album. I deleted the album all together and tried again, this time around it didnt even add.
The album/artist is "Anberlin - Lost Songs