Error in BLEND "calculation".
When blending 2 strokes it draws the shape correctly, however, if I outline those strokes, there is an error.
Same thing occurs when outlining the strokes first or when just drawing the objects before blending.
This problem however goes away is I move the top right point of the top object down just a bit. As soon as I move it back up, at a certain point, AI draws weird shapes that is not actual "steps" in the blend.
I have tried resetting all anchor points and redrawing the objects also.
My guess is that there is an error in the blend "formula" somewhere. @adobe: Please see the attached file. Something is wrong!