This happens when you set or select a specific sprint as your "set as team's backlog iteration" and the solution for this is to the following:
1) From the project homepage in VS Team Services.
2) Click on "Configure Schedule and iterations" link under other links section.
3) Select "Iterations" tab.
4) Set "set as team's backlog iteration" option to the top level.
5) You will notice check boxes have shown, where you can select which iterations to show or hide.
6) That's all! you will be able to view all selected sprints either previous/current or future ones!