Fiddler users expect Fiddler to display URLs exactly as entered e.g. in the browser's address line.
However, when the URL contains an anchor (i.e. "http://...?...#anchor), this is not shown anywhere by fiddler, neither in column "URL" of the session list, nor in the inspector window.
Browsers, by-design, never send the url "fragment" (the portion from # onward) in the network request. As a consequence, Fiddler (and the server) have no way to see it.