When you're on the combo page and you press i to shift all subsequent combos down by one, Freeform combo graphics don't get updated. That is, any freeform combos that have their graphical pointers pointing to a combo after the combo you've highlighted when you were pressing i, remain fixed on that spot, rather than increasing by one to match the location of the new combo. It seriously screws things up.
This goes for Combo Aliases as well.