By default, QlikView does not sum the values of the lines. And it shouldn't either.
Instead, it calculates the expression over the entire data set. This makes a great difference when calculating ratios, as you do here. Let's say that you want to calculate
Sum( A ) / Sum( B )
and format this as a percentage. Then the most logical thing to do on the "Totals" line, is to calculate the same ratio but for the entire scope. Summing a number of percentages usually does not make sense.
That the total here is 0.0% does not need to strange. It could be that it is 0% for almost all data, and the numbers, e.g. 36.5%, could represent a very small fraction of the entire scope.