When a TSV value is modified at a user level, the modification switches back to the default value after logout.
For example, navigate to Home --> Projects --> Click on a Project --> Team --> Details Page
Configure the TSV to show the Start Date from Jan 2017
In the below screenshot, the start date has changed to Jan 2017
Logout and login back and navigate to the Team - Details page of the above project to realize that the TSV start date has changed to the default start date which is May 2017