Contours from Sandbox

Hi All-
I am trying to create a surface/face from contours I got from a surveyor. I can import them just fine and then when I select the contours and create button in sandbox tools it gives me a surface but it triangulates everywhere.

I’ll attach a image of the retaining wall for reference, it suppose to be a sloped sidewalk and a retaining wall but you can see it doesn’t quite know where to connect.

How can I smooth this out? Do I need to set up the drawing different?

Yes, the mesh created by Sandbox is triangulated.
Sandbox only creates sloping terrain. It cannot create vertical surfaces.

I have my vertical wall lines, offset just a bit so they aren’t on top of each other. but it’ll look steep enough to be flat in the final render