On their chart, Oct 7 now reports 49,358 new daily cases nationally. Your spreadsheet above shows 53,478.
That's a difference of 4120. If you look at the above, they reference 406, 421, 1467, 1181, and 434 cases that occurred in the past. That's 3909 cases, pretty close to the 4120.
They're constantly trying to revise to get the numbers assigned to the right dates, even when states don't actually report things on time accurately reflecting the dates that cases/deaths occurred.