problem in genrating subsurface with proam
 

I have a simple model but when I generate the subsurface where I have the no subsurface type I find collpsed vertex without offset in the edges.This vertex are in a set and is like it was not possible to offset them. I use "Avoid self intersection" and advanced method 6 (or 7), and in preparing my model to keep edges I use lines. Could someone help me? Thank in advance.