Question about a work's calculated author

Could someone help me understand why this work's author shows up as it does:

http://www.librarything.com/work/355475/editions

It shows on the work as:
Conjuration of Kronos
by Frater Achad (Charles Stansfeld Jones)

I don't really understand why it wouldn't show as "Frater Achad". There's been a lot of combination happen to the author(s), so perhaps this is where I'm losing the trail.

ETA: Please don't "fix" this work. If it's actually a bug, I'd like to keep broken so I can show Tim and he can fix the underlying cause.

There aren't four copies, there are 10. Frater, Achad is used for 5 of them.

4> No worries. Maybe The Algorithm misread the number of copies, too!

6> Yeah, please don't fix it. I was going to report it as a bug, but I wanted to check first and just see if there was some reason why I was simply just missing something and it was working as normally. It's similar but not identical to r.orrison's topic. His is more about how blank authors shouldn't be considered when calculating authors (and coming up with examples). I think it's likely (but not 100%) that these are two different issues causing the problems in this and his examples.

ETA: Added a note to the top so someone else won't come along and fix it before reading down this far.

I've posted a bug about the blank author issue, with a link back here in case there is some connection in the code.