The averages are not the same as the median values, I think this is where some of the problem comes from. The plots have quartiles with the boundaries shown as lines. The line showing the median value for the Ampre system is near the middle of the plot, but the median value for the AMD plot is far over to the right end of that plot, suggesting that many of the results were in a narrow range just above that value. This would skew the total average energy consumption way up, so we would see the difference shown in average Joules per run. This is probably not a good type of plot for this type of data, a scatter plot or line chart may be better.
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