Problem removed??? Errors in "Composers" menu

I have presentation for Composers set to "Display Category".
I have a lot of CDs with music by Johann Sebastian Bach ripped to my server (all quite legal...) in FLAC format.
The FLAC (Vorbis) tag "Composer" has been set to "Bach, Johann Sebastian" for all the music files in this Bach collection. This was done using "Easytag".
I am absolutely sure of this, or at least as far as my eyes can read the fields shown by Easytag.
However, when I browse the "Composers" menu on any and all renderers and control point apps on my android phone, a few albums in the Bach collection show up under the composer "Bach, J S", not "Bach, Johann Sebastian". I have racked my brain and painstakingly checked on all the files, but I cannot see any reason why this error occurs.
All these "error" albums have been in my library a very long time, and they all had Composer set to "Bach, J S" before I edited it all a few days ago. But so did most of the other albums, too!
What could be the problem?
I have a lot of CDs with music by Johann Sebastian Bach ripped to my server (all quite legal...) in FLAC format.
The FLAC (Vorbis) tag "Composer" has been set to "Bach, Johann Sebastian" for all the music files in this Bach collection. This was done using "Easytag".
I am absolutely sure of this, or at least as far as my eyes can read the fields shown by Easytag.
However, when I browse the "Composers" menu on any and all renderers and control point apps on my android phone, a few albums in the Bach collection show up under the composer "Bach, J S", not "Bach, Johann Sebastian". I have racked my brain and painstakingly checked on all the files, but I cannot see any reason why this error occurs.
All these "error" albums have been in my library a very long time, and they all had Composer set to "Bach, J S" before I edited it all a few days ago. But so did most of the other albums, too!
What could be the problem?