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Gavin, which scope/camera did you use?
Apart from the already mentioned atmospheric conditions, focus and processing issues, if you used a refractor another possibility is the inadequate colour correction for UV.
Most of APO refractors (unless you sell you kidney and your car to get one) will have some "star bloating" in blue/UV. This includes triplets but to a smaller degree. If your camera is sensitive down to 380nm then this may be a reason for the size of the stars.
(Reflectors are not affected by this)
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