For different views and reports in Aha!, when you make changes, a blue Update table button appears. On the other hand, when you make changes to the timelines of Releases, Phases, or Milestones in the Releases -> Roadmap view, in order to see the Gantt Chart updated with releases, phases, and milestones re-sorted in the proper sequence, you have to click on the browser refresh.
It's not real intuitive that this is what you need to do. It would be more intuitive if the user was prompted with a button that they have made updates and for those updates to be reflected, they need to click on the "Update chart" button.