It’s targeting what they want to sell you depending on what target group you are, it’s never been what might actually interest you personally.

The page itself is just a map with a legend that says that the red lines on the map are roman roads.

Except if you look at the legend, and click on the image for the red line, that white rectangle with a red line links to a file that is named “thin red line for nurses flag.”

It’s just a coincidence / lack of attention / someone picked a random image that looked good enough for a map legend.