It appears from the code that the font is forming up aalt as follows, here using o to represent an item and not showing as many rows as are used in the font.
o
o
o
o
o
oooooo
oooooo
oooooo
oooooo
oooooo
PagePlus X5 appears, in effect, to use that data to form a matrix, by copying the last item in each row to fill each empty space in that row, shown here using e for each copied item. I have used e rather than c as using e allows the diagrams to display better in this forum post.
oeeeee
oeeeee
oeeeee
oeeeee
oeeeee
oooooo
oooooo
oooooo
oooooo
oooooo
The matrix is then transposed about the leading diagonal of the matrix as follows.
oooooooooo
eeeeeooooo
eeeeeooooo
eeeeeooooo
eeeeeooooo
eeeeeooooo
However, PagePlus X5 only shows the first so many columns of the result, so only some of the columns with the extra copies are shown and none of the columns where six choices are available are shown.
I wrote "PagePlus X5 appears, in effect, ..." because I do not know the order in which PagePlus X5 processes the data internally.
William