Go to the Oozie Editor of one particular Coordinator
Notice that the advanced options (the blue icon with three sliders) can be toggled both under "How often?" and under each entry of "Workflow Parameters".
The details there are editable, even without clicking on the Edit button near the top right corner (it's in its default gray color, rather than black denoting that the content is editable).
Expected: it's okay to toggle showing the advanced options, but they shouldn't be editable.