Look at the first two spots in the leaderboard in this image: imgur.com/ueCMo.
Aoi appears first. Level 52, with 2,873,101 xp.
Tripearl Jam appears second. Level 53, with 2,867,668 xp.
Level and xp are updated at different times? Or different players need different amounts of xp to level up? In any case, looks contradictory.
(I've seen this before, but it's nice to capture it involving the first two spots in the leaderboard.)
(The time you see at the top right of the screenshot is, logically, my local time. That is, GMT -3.)