From what I've seen, when K4 renders a stacked bar in some top-bottom color order (e.g., red, yellow, green), the legend is listed in the opposite top-bottom order (e.g. green, yellow, red). Right now, it's easy to see the two orderings are different, but it's not so easy to see that they are opposite. As a result, moving from bar to legend turns into a matching game, which can be even more annoying if the colors are close together or you have some condition that makes distinguishing colors difficult.

I'd like to see the legend listed in the same top-bottom order as the bars.