Loft making weirdly

when i used loft component, other lines i didnt expected were connected each other. Does someone can tell the problem and way to fix it?

residence vilamoura (19.7 KB)

Best, Keisuke

residence vilamoura (14.9 KB)

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Dear Kim
Thank you for the quick response! everything is going well!

Hi everyone and HS_KIM
If you could, please tell me how it is working?
It seems just merge both of them and graft. what process is going inside?