I don’t have any scripts or blocks that would create this kind of geometry and I can’t enable/disable it anywhere when clicking through my script. Can someone help me understand what’s going on here?
You can tell by their color that all of the objects in your grasshopper file have preview enabled. If you disable preview (by right-clicking on a component and un-checking Preview) the color changes to grey. You can also turn off preview for multiple components by selecting them then right clicking on the canvas and selecting Preview Off.
If you select one or more of the components in your grasshopper file, the appearance of the selected object(s) in the Rhino window should change.
You can change the preview properties of normal and selected objects by clicking this icon in the grasshopper toolbar.
That’s excellent (and very patient) detective work, considering that @Abigail didn’t post her GH file. And that the image of her GH file appears to my eyes to be under-sized?