Inconsistency with Various artists

Hi,
I have my music organised into the following three “sources”:
Music – Adults
Music – Kids
Music – Shared

In each source “Various artists” shows as a single artist (as it should)

I have then tried creating both custom nodes and smart playlists to cover the following group
Adults – contains “Music – Adults” and “Music – Shared”
Kids – contains “Music – Kids” and “Music – Shared”

The issue I have is with albums by “Various artists”.

In the Adults node which is sorted by Artist, correctly “Various artists” is shown as a single artist, and albums are shown within that.
Bizarrely, the Kids node (which to me looks identical other than the sources used), shows the individual artists on the “Various artist” albums and then the album under that.

Any ideasConfused?