Why "rail revolve" result is rotated?

After performing rail revolve, the result is a bit rotated. What is wrong with my rail revolve?

Screenshots and scene are attached.

railrevolve.3dm (3.2 MB)

maybe the heart was not in the right place? :wink:

anyway it performs as expected when you let the profile actually touch the exact ending of the rail curve. it then will also perform a cleaner revolve.

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Thank you very much for your hint! Indeed…