How to Unlink the sprint between multiple project?

[Vinoth Kottaisamy]

We have 3 projects running on Jira Cloud. Each project has its own Board, Release and Sprint running parallelly. But however, when am trying to change the sprint details in one project it affects the sprint in the other projects as well. 

Ex, Project 1 has a sprint Goal of XX, and started the Sprint. 
When I'm going back to Project 2 to start the sprint, It shows the sprint has been already started with the Sprint goals XX which I have mentioned in Project 1. 

But the Tickets and Backlogs in each project are still different. In case If I remove the sprint in one project, It removes in another project as well. 

Can someone please help me with the configuration? 

FYI, Each project has the filter, share and query for its own Board, but somehow still it's been connected to each other

[Alexey Matveev]

Hello,

It means that your boards select the same issues. If you include an issue to a sprint on one board, the sprint will appear in all boards, which select the same issue.

You would need to edit filters for the boards (board settings -> general tab)