Offset surface not working in partially bent surface

Rhino Rhino for Windows
1

Hi,

There is a triangle with 1/4 quarter bend in each side, the Surface Offset command doesn’t work. Whats is wrong?

Thank you in advance.

2

Works fine here…

image
image.jpg783×455 61 KB

3

Strange how now Bend and Offset work fine now.

Thank you.