Currently divisions with an empty draw appear in the schedule. The schedule then isn't correct because those divisions won't run since there is no one competing in them.
Sometimes divisions don't get any entries. When the "generate draw" button is used to create draws for the event, those empty divisions will automatically get an empty draw created for them. This then automatically includes them in the schedule.
Unfortunately it's not possible to remove those empty divisions from the schedule directly. The workaround is to make a group and add those divisions, which effectively resets those divisions to having no draw, so they are no longer shown in the schedule. This workaround does work, but isn't intuitive.