Quick question before i start sorting the metadata on some of my albums.

When i browse my music using the Naim app under the "Artist" tab then say press "D" not all of the albums surname beginning with "D" are showing.

When i look at the metadata some of my albums have more more than one sort field, some have no sort field (mainly downloads).

Artist Sort

Album Artist Sort

When i edit the metadata do i delete "ARTIST_SORT" and "ALBUM_ARTIST_SORT" or do i add them to the albums that do not have them. Am i right in thinking these duel fields are the cause of my problems.

Naim Uniti Nova.
Qnap HS 251 nas.
Asset 6.2.