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If it makes you feel any better, I've managed to get that effect with my 77mm lens. It is more likely to happen with more complex lens designs that have more elements (zooms). I did a shoot some years ago with my 77 on the LX. The customer wanted a romantic, candle lit set up, and so, rather than do the smart thing, I set up a bunch of candles and started shooting. I believe I had one of the Pentax Ghostless filters on the lens. The results were pretty enough, but there were probably a dozen reflections of the candles in odd places around the images.
I suppose it is possible you have managed to invoke some sensor ghosting, but I've never seen it to know what it is, and don't really know what it looks like.
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