We encounter this not clear phenomena:
When we close a sprint, we are asked what to do with the non-completed issues.
When we ask to move them to the next sprint, their "Sprint" field will now have 2 values: The new sprint, but also the prev sprint.
And if we won't complete them in the second sprint and move them to the 3rd sprint, the sprint field will now have 3 value: Sprint 1, Sprint 2 and Sprint 3.
We assumed that once we will move the non-complete issues to the next sprint, it will only have the value of the current sprint.
Is this "sprint history" a feature, a bug or something from our configuration?