You've left off the right side of the spreadsheet.
The 2x2 red box that you've outlined is the total load for the 17,19 double pole load added to the 18,20 double pole load on the right side.
The 1x2 red box at the bottom that you've outlined should be total load for the panel, both left and right sides.
However: The 0.2 kva total load for AC-4 seems suspiciously low, and I wonder if there are other low numbers in the spreadsheet.
-Jon