Why do two of them appear green? All of them have solid element operations applied.

[LeeJaeYoung]

Why do two of them appear green?

All of them have solid element operations applied.

Operating system used: Windows

[vistasp]

The first thought that comes to mind is that it could be a missing classification, or an undefined structural function.

What overrides are you using?

[LeeJaeYoung]

If you use hidden selection, it is pierced.

I don't really know what to say.
I don't even know what to show you.
I'm just wondering what to look at when I get that error.

[vistasp]

What Graphic Override are you using?