penetrating elements in a surface
 

Hi everybody,

I have a problem with penetrating elements on a surface when I increase the number of nodes above a certain numer (6). As you can see in the picture there are 10 nodes and the penetrating elements are highlithed, but they are in the middle of the surface. I had already problems with penetrating elements, but never in the middle of a surface..

What could be the problem? I tried with riassociating again to that surface but is has no effect..

Thnks in advance