Polysurface edge issues when split or trimmed

When I trim or split polysurfaces something strange happens to the edges (which i don’t know how to describe)

Sometimes it’s more severe and evident in the model, other times it only shows when I render.

I’ve tried bringing the original cad drawing into a new model and the same thing happens.

I’ve been using the cad drawings in Rhino for years without any issues.

Screenshot render

hard to tell without the file or a portion of it. My guess is maybe you are working to far from origin