Monthly Leaderboard

I understand that due to time zone differences, some people can be "ahead" in the leaderboard by one day, and that it all gets evened out at the end of the month. Why though doe see a person here ahead by 2 days, shouldn't the max be 1 day? (I have answered all questions for the last 10 weeks, all correct for at least the past 90 days...)

I didn't find the right solution from the Internet.

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