when I closed the ticket before the sprint started, the ticket disappear from "done" column of the sprint , which I think is right. But then it should not appear when the sprint starts.
This second part is what I think is wrong, since it gives the impression that we have worked on that activity during the sprint, which is wrong . We have NOT worked on that topic during the sprint, since it was closed BEFORE the sprint started.
NOTE:
sprint field is attached in the issue
Sprint: proj_Sprint X (Where X = current sprint number)