The only thing that I can think of that would affect the numbers, is different time zones. I assume that midnight PST is when they stop collecting data for that days results. So let's say you pulled an all nighter playing, or got up super earlier. Anything past midnight PST would get rolled over into the next days total. I am ahead of PST so for anything I do after 9pm on say a Monday, won't show up until Tuesdays results are posted on Wednesday.
