LMS 8.0: Very strange sorting order?

Hello!

It seems I have a very strange problem. I have albums from "Marius Müller-Westernhagen" and "Westernhagen" (He changed the name for newer albums).
When I go into the menu via "Artists", I find the following order:

Madness
Manfred Man
Marillion
Marius Müller-Westernhagen. <-------
Mark Knopfler
...
Mike + The Mechanics
Milla
Westernhagen. <-------
Mungo Jerry
Nazareth
...

Unter "W" I can not find Westernhagen. I have nothing in the sorting Tags in the MP3 files for this artist.
This is an example of a file with all the tags inside:


So why in the world is an artist with "W" inserted at "M"? This is the only artist I can find that is wrong.

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