Key Influencers reference line does not match with increase value

Hi all,

For the Key Influencers visual, the Reference Line is not matching with what the values it's saying for the trend. Sometimes the reference line would show a positive trend, but it was state a negative trend. I can't post the original report, but I tried to narrow down the issue and simplify it as much as possible and still couldn't figure out the cause.

I reproduced the issue with the table below. Comparing X to itself should yield a slope of 1; however, the results were always different no matter how I changed the values or how I configured the visual or fields. This results in saying "X goes down 1.07" as "the average of X increases by .96"

I'm not comparing the value to itself in my actual report, but hopefully understanding and knowing how to fix the issue in this simplified version will help me fix the issue with the visual in my actual report.

Thank you in advance!