I was in my profile and noticed "top 3% this month". The ego-stroke was interesting, so I clicked it.
Upon arriving at the league list, no problems; upon clicking the week- or quarter- tabs, the #1 spot (my own, surprisingly) occupied two rows (by double entry, not by vertical aspect being stretched). Clicking the month-tab showed the double row entry as now being present there (where it hadn't been doubled upon my arrival at the page).
The problem persisted in these three tabs, though it didn't show in the year- or all-time- tabs (possibly a telling point, since I'm hardly #1 in either of those tabs).