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Possibly your vanes are not aligned directly opposite each other. In a three vane setup you can sometimes see 'ghost' vanes in the view opposite each vanes more obvious spike. One of the advantages of a 4 vanes setup is these are normally hidden in the opposites vanes spike.
You diffraction spikes are also quite colourful and defined. I would guess maybe twisted is another posibbility. Are the vanes blackened and thin?
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