Menu item won't go away

[hildegardevongamin]

In .../root/hugo.toml I currently have:

[menu]
[[menu.main]]
identifier = "home"
name = "Home"
title = "home"
url = "/"
weight = 10
[[menu.main]]
identifier = "about"
name = "About"
title = "about"
url = "/about"
weight = 20

But when I click the About page I suddenly have a 3rd link pop up in the menu—which was in my original list in the same hugo.toml file as the text above but I've deleted the code, saved the file, reset cookies, shut down local server access and rebooted the computer—none of this has worked. I don't know why it only appears on the About page and don't understand Hugo enough to know where else to look.

I would like to bring the 3rd menu item back eventually, but the markdown page needs more work.

Any ideas?

Here are some screenshots of the menu.