Why does my sweep profile not follow my sweep path?

Frustration:

Maybe because I am a SW newb?

Maybe because the model I am working on is horrendously patched and built without regard to stability?

Maybe because SW is just prone to errors?

I have two questions.  The first is my post subject - pretty self-explanatory.

My second is simply: WTF?

Hopefully you can see this.  Measuring the feature confirms that what you see is real geometry and not a faceting / graphics thing.

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Any ideas?

Thanks,

-Nate

SolidworksParts And Features