I used RUMLogNG so I had the same problem. The spreadsheet was set up to expect cumulative (running) totals. So if your last QSO on day 1 was #100, put down 100 on that day. If you made 50 more QSOs on day 2 such that your last QSO was #150, put down 150 for day 2. The totals for everyone are on the Jul 7 column, which is why you need to carry things forward to the right for there to be a number at the bottom.
IOW, any given cell should be greater than or equal to the one to the left of it.