Peter K. asked me about this 538 chart, which is a stacked column chart in which the percentages appear to not add up to 100%. Link to the article here.
Here's my reply:
They made the columns so tall that the "rounding errors" (noise) disclosed in the footnotes became the main attraction.
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The gap between the highest and lowest peaks looks large but mostly due to the aspect ratio. The gap is only ~2% at the widest (101% versus 99%) so it is the rounding error disclosed below the chart.
The lesson here is to make sure you suppress the noise and accentuate your data!
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