Audrey, the subforms on each page that contain the sections that you want to resize are set to Position Content. This means that any object inside the subform will always be rendered in exactly the position that you set it, even if other things in the subform are added/removed.
You need to use Flowed Content for subforms in which you want the objects inside to move up/down as things are hidden and exposed.
To demonstrate, The "time" checkbox seems to be wired up correctly, so set the containing subform on page 3 (the "untitled Subform" above "testcomments") to Flowed Content. This will allow the underlying subforms to flow upwards/downwards and fill in the gaps when the testcomments subform is added/removed.
