Error top surface offset,Is there a rhino software error on my computer?

when i use command “offsetsrf” with outside then error with top result surface. Why this error? Do you help me?
Version 6 SR29




offsetsrf.3dm (288.9 KB)

if you use the solid option it works better, then you can mergeallfaces to delete the squares

Thank!
I know it but the problem does not happen old version when solid = no

Hello - as far as I can see the behavior is the same in V5 - to result is cleaner in both if Corners=Round, which is a mre true offset than Corners=Sharp.

-Pascal

Right. It is cleaner with Corners = Round but it not for the material thickness.