Minor and specific, but it's been bugging me for a while.
The "Upward trend" is shown with a red line, which is negative. Usually upward to the right is considered positive. This is contradictory.
What's worse is that the downward trend isn't red, but blue. This furthers the confusion of positive and negative.
Swap the colours around, and possibly make the blue green instead.
I know it follows the design of unicode or whatever, but that doesn't mean they are less confusing because of it. I can only think of Chinese people as ones that would possibly see the red colour in this setting as positive.
Currently looks like this:
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