XP calc bug?

I just reached Level 93. According to what I read online, I will need 14,000 xp to reach Level 94. This is my last level for accelerated leveling (LV49>>LV93), so 14,000 less the accelerated leveling 20% discount is 11,200. But when I look at the Pause Screen or the Progress Report, they both say I need 11,661 XP.

Is this a bug or am I calculating something incorrectly?

The difference (461 XP) is not really material but I would like to know if this is a bug.

Thanks.