Can't reorder triggers in Storyline 360

Each trigger is attached to an object, and the objects are sorted alphabetically. You can change the relative position of a trigger if an object has more than one trigger. Otherwise, you can change the name of the objects, and they will move up and down in the list.

Be aware that trigger order matters. but only among triggers that are initiated by the same action. Since yours are fired by clicks on different objects, there is no need to change their order.