Folder/Playlists won't stay in order

I created numbered playlists to keep them in order in iTunes. Once I go to my ipod (nano 6th gen, 8 gig), the playlists are out of order in the area where I choose the playlists to put on my nano. It seems like a bug. I even put them in a folder to try to fix it, and they're still out of order. Any ideas?