Sweep 1 with Helix flipping out

Ok I figure I am doing something very small and wrong as I cannot get a curve to sweep on 1 rail without flipping its alignment direction. Any ideas as to why this would not align and flip like this?

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Try it in the Right or Front viewports so the profile doesn’t pass through a vertical orientation.

Or you can stand up the helix so you can run the Sweep in the Top viewport.

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Usually the best way to control alignment of the shape as it sweeps is to use Sweep2.
HelixSweep2.3dm (194.3 KB)

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