We have a project defined in TFS (TFS 2012 - using scrum process template) that has three teams and three areas defined. In the latest sprint, the backlog and sprint board for one of the teams (Red team) is showing items that are assigned to that team, as well as one of the other teams (Blue team).
When a member of Red team views their backlog items for the current sprint, they see items that are assigned to both Red and Blue teams. When a Red team member opens the Board page, and clicks the "Person" link in the top right of the page to filter the board for a given person, the list of persons displayed includes all members from both Red and Blue teams.
When members of the Blue or Green teams view their boards and backlogs, they only see the items assigned to their own team, as expected.
I can't find any problems in the way the teams and areas are defined, and we've been running with these three teams with no problem for two years. It is just the current sprint that is showing this problem.
Any ideas of what could have caused this problem?