Why does clicking on a topic (tag) open a page that says "Page not found"?

Question

Toaster

When I write in a search engine (for example, algorithms), a corresponding topic appears in the drop-down menu, when clicked, a page comes off with the inscription "Page not found". The same thing happens when I click on any topic above the questions.

Answer 1

It’s not like that for me - everything works fine, but the story is interesting, tell me more.