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If you have a look at my last image of the running man you will see if you look up close i have the same issue, though unlike your issue mine is only just off and if your not looking closely you will miss it.
After doing some reading i believe that with twisted vanes all it should effect is the width of the diffraction spike as your mirror sees a larger vane than it actually is (because it presents a larger surface area) so you may be able to see this as the diffraction spikes getting larger and smaller. Though i cannot speak from experience and somebody else may be able to give you a much more informed reasoning behind the physics and resultant diffraction pattern.
Regards
Brendan
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