Hi,
I am Admin & user for more than five JIRA projects. When I want to edit the "Sprint" field of a ticket in one of the project, the drop-down list displays the whole list of Sprint names from all of my projects. The same for all the team members. If I select a wrong Sprint name by human error, that external Sprint also gets displayed in my "Backlog" view and in "Active sprint" gets changed if that sprint is an active sprint. In short the whole project board gets corrupted.
sample scree-shot shown below (The Project I am IN is "DC", I dont want to see any other boards/Sprint names but it shows and causes errors):

How can I switch off this global listing of all Sprint names in all the projects? It us causing a lot of trouble and making JIRA boards un-usable right now.
Thanks
Praveen