Join Curve component won't join my offsetted curve

Hello everyone,
I’m new to grasshopper and wanted to make an arc with the plugin. Everything works well but the Join Curve component. I want to join my curve and its offset together to use boundary surface, but they aren’t joined by the component. Here I put a picture to show what happens when I use offset instead of boundary surface at the end:

6 o 3 beyzi - Copy.gh (20.8 KB)

this

multiple wires going into the same input, is bad

I’d suggest to use Merge component to join multiple Lists together, so you see what’s going on by inspecting the Merge output:

as you can see, your data is organized in multiple branches, so the Join + Offset components are working on each branch separately

you can flatten the ourput of Merge to flatten all the data in the same branch:

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it works properly! thank you very much!

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