You're actually seeing the 'old' method of how mile/certificate upgrade requests were displayed in your itinerary. It used to show the original confirmed segment, along with a waitlisted one for OP.

Some point earlier this year, it changed to start showing a generic 'systemwide upgrade requested' for the original segment instead of the separate waitlisted one, although I've also still had some itineraries that showed the old method or a combination of the two.