Wrong or confused sort by Artist Name

The list of Music by Artist Name on my Media Server is wrong somehow. Each artist name is correct but they are sorted in a confused order. For example, Neil Diamond and Willie Nelson are both presented in the N list.

The tags for Neil Diamond:
Artist Name Neil Diamond
Track Title Song Sung Blue
Album Title Hot August Night
Date 1999
Genre Easy Listening
Composer
Performer Neil Diamond
Album Artist Neil Diamond
Track Number 04
etc.....

The tags for Willie Nelson:
Artist Name Willie Nelson
Track Title Blue Eyes Crying in the Rain
Album Title 16 Biggest Hits
Date 1998-07-04
Genre Country
Composer
Performer
Album Artist Willie Nelson
Track Number 01
etc....

So, my question is why does Neil Diamond become listed in the N's for "Neil" and Willie Nelson become listed in the N's for "Nelson"? Similarly, Artists Graham Nash, Nat King Cole, Nancy Wilson, and The New Christy Minstrels are all under the N category. I must be missing something or have a bug.

Its a small library, all in FLAC format with tags (344 Albums, 4845 Tracks, and 595 Artists total).
I am using: Logitech Media Server Version: 7.7.5 - 1416570306 @ Thu Nov 27 07:38:09 CUT 2014
Installed on Windows 10 Home 64 bit

Thanks for any insight you can give me.