Oh wait, I get it -- it's not the order of object creation; it must be the order of connection creation. And I'm pretty sure I had followed the video and used fan-out to make the connections.
In that case, fan-out is not following right-to-left -- if I had shift-dragged to the leftmost number box, it's probably making that connection first and filling in the others later. That would explain why t would be hitting the left one first.
EDIT: Confirmed, that's exactly it. If I shift-drag to the rightmost target object, then the connections are created in right-to-left order, and "triggerize" then accurately reflects that order. (So then the issue is that the video models the behavior of shift-dragging to the leftmost object, without explaining that this will give you a connection order that you didn't expect.)
hjh