I suspect this is simple round-off going on based on the scaling required for your particular display resolution. That is, the actually size of the palette cell is scaled by the degree to which your display differs from 96 DPI, and since the result won't likely work out to an exact number of pixels, it gets rounded off. We can't dispay partial pixels after all. So probably nothing to be done about it. Unless I'm misunderstanding something. Looks harmless enough in any case.
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I suspect this is simple round-off going on based on the scaling required for your particular display resolution. That is, the actually size of the palette cell is scaled by the degree to which your display differs from 96 DPI, and since the result won't likely work out to an exact number of pixels, it gets rounded off. We can't dispay partial pixels after all. So probably nothing to be done about it. Unless I'm misunderstanding something. Looks harmless enough in any case.