toannual calculates sums and averages of a fints incorrectly

Converting a monthly fints to an annual one using toannual includes the parameters to calculate cumulative sums and simple averages. For example, a monthly fints of data fts = [1 2 3 4 5 6 7 8 9 10 11 12] ought to give a CumSum of 78 and a SimpAvg of 6.5. Instead, the expression fts = toannual(fts,'CumSum') gives 54 and fts = toannual(fts,'SimpAvg') gives 6.75.

Please help out