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I'm not sure what the problem is. The image is of a saturated image of a bright star that is slightly octagonal. It seems to have even diffraction rings all around it. If it was a collimation problem then the image would not be even.
It is a refractor so no diffraction spikes should be present.
Are there any non circular baffles in the scope or focuser?
This is a similar effect to what the aperture ring makes with a camera lens.
The only other think I can think of is that the light from the saturated star is bleeding along the lines of pixels in the camera. I don't know what camera you used but does it have microlenses on the CCD?
It may be an effect from the antiblooming in the camera.
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