Where is the quirk ?

 From:  Frenchy Pilou (PILOU)
6230.1 
Fillet was = 2
I have trimed the edge because the fillet of one or two entiere "half" edge failed!
Following the selection of one or two pieces of the trimed edge, that works or not!

I can understand that don't works when I select only one but why that works when i select 2 pieces of edges touching themselves?

And why the fillet is appllying of the "all "edges and not just on the edges selected ?

Some mysterious for me! :)

Flie 3dm linked after the image!



http://moiscript.weebly.com/uploads/3/9/3/8/3938813/fillet_fail.3dm

EDITED: 21 Oct 2013 by PILOU