Reading List, Notifications, Conversations buttons not functional on forum post pages

While on a forum post page, like this one, the Reading List (eyeball), Notifications (bell), and Conversations (word balloons) buttons on the site's top right menu are not functional: the number normally overlaid on Notifications does not appear, for instance, and clicking on any of the buttons pops up a small, blank text field.

(By the way, these buttons also, in any page, don't seem to have hover text, which could help the user who doesn't understand the meaning of their image.)