The screenshot is taken during transition on purpose.
As already mentioned in #lounge, the new feature highlights people in friendlists within the rankings.
But while scrolling through the difficulties, the name in the ranking pop in while the transition or roll-in of the ranking list isn't done, yet.
This might be a minor bug, but looks pretty disturbing when scrolling through the difficulties, since it has apparantly a bugged appearance.
Requesting confirmation and fix, here.
Edit: wow, Deif ninja'd me. t/87880