I have a problem. Let's say I have two projects, A and B. When I complete the sprint in project A and move open issues to the new sprint, my sprint in project B also closes, and all issues go to the backlog (I guess, haven't checked this moment). I was forced to reopen the sprint, and it reopened the sprint in A as well.
Why does this happen? It is super annoying. I almost had a heart attack today. I manage approximately 300 issues. I want my projects to be independent; I don't want closing the sprint in A to affect B. How can I tackle this issue?