Log entry I cannot explain

[Klaus57]

Hi Simon,

In my log file, I found an entry I can't explain:

"Scanning directory András Schiff
Scanning directory Franz Schubert_ Sonatas & Impromptus
Warning: Ignoring conflicting custom value for ALBUM_ARTISTS tag 'András Schiff' in file András Schiff/Franz Schubert_ Sonatas & Impromptus/01 4 Impromptus, Op. 90, D. 899_ 1. Allegro molto moderato.flac
applied sort value is 'Shiokawa, Yuuko'; conflicting sort value is 'Schiff, András'"

When I edit the album with Songkong, I only see András Schiff, regardless of the role.
With the LINN App I cannot find this album with Albumartist = Andras Schiff but only as an artist = Andras Schiff.
Minimserver is installed on a QNAP NAS (HS-264)
Controllpoint is a iPAD with LINN-App installed.

Attached are the simple log, the detailed log, my configuration, and two excerpts from the Songkong editor.

Thanks and best regards,
Klaus