weird offset deviation

Hi ALL

There's 2 of 32 offseted curves that are driving me crazy. The phenomenon its the one on the picture from below. When I offset it alone, it does the same zig-zag behavior. I think it has to be something related with a weave component it has behind... but no way to understend wha'ts happening... anybody have had the same problem, any solution somewhere...?

THANKS !!!