[Inkscape-user] Bug in conversion of line to outline

Hi,

I've been working on a simple design for a logo. For some strange reason, when I try to convert the lines to an outlined path, I loose some rounded corners, while others remain. The issue is highlighted with a red circle.

File can be fount here: http://veiligheidspictogrammen.be/bugs/line_to_outline.svg

Can someone explain this to me?