Hash-only href location in Ember

In an Ember app I'm building, I have a hash-only link like so: <a href="#foo">Foo</a>, on a page that isn't the root (i.e. localhost/bar). If I inspect the element in the console, the href property is localhost#foo, instead of localhost/bar#foo like it is on other sites. window.location.href return localhost/bar, so the browser definitely knows where it is.

What could be causing this discrepancy?