I'd guess that's the exp required for level 1-50?
Also the experience required for champion points is given by some formula which also works for 0, so GetNumChampionXPInChampionPoint(0) does return some number even though there is no 0th champion point. However, GetNumChampionXPInChampionPoint(0) is only 32k so it's not the main source of your difference.
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