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It's not the eyepieces. Changing the EPs and seeing the same effect confirms this.
Primary mirror could be held too tightly in its cell causing deformation.
You may have chanced upon a very nasty jetstream rocketing in front of Saturn & Mars as they are close together. This has happened to me once or twice before on bright extended objects like planets and the Moon. The effect can provoke a twining effect due to extremely different atmopheric currents. Somewhat like some crystals can cause a double image of that lies underneath. My high school physics is a bit dim nowdays to explain it better.
I suspect the latter from what you described that your view of the Jewel Box was fine.
Mental.
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