Issue creating surface with the _EdgeSrf command

Hello, I’ve ran into an issue when trying to create a surface from 4 curves using the _EdgeSrf command. When I create the surface, it actually creates two joined surfaces one that’s expected, but slightly narrower, and one that fills in that narrow gap. Here is what it looks like:


And the selected curves are the original curves from which the surface was created.

I thought that maybe the curves weren’t fully connected so tried joining them into a single curve, and it becomes a valid closed curve. I am very much new to Rhino, so I don’t have an idea what I could be doing wrong.

Thank you in advance.

Upload a .3dm file with your input curves. You can upload the file by dragging it to where you type a post, or by clicking on the vertical arrow icon above where you type a post.

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