The chart should have used colors that were farther separated from each other in hue.
I completely missed the color difference. If I had noticed it, I would have seen the bit about the females.
True, as it typically is in such charts. There must be a manual that web site authors follow that warns against using colors that stand too much in contrast, or do not render right on smartphones. Which device I believe has degraded the Internet.
But I like a variety of bright colors. One example, by the grace of God: https://peacebyjesus.net/booksofthebible.html
Which Google ignores (as it does most of my site) - at least the first 30 results (as far as i went), even if I search the opening sentence - The 66 Books of the Bible Categorized and sectioned for easier memorization, with short summations - even if I place it in quotes
"Your search did not match any documents" It simply does not exist according to Google. Likewise Brave.
Yet both DuckDuckGo and Bing place that results for that search term (even w/out quotes), as the top result. I do not think it is due to the colors.