Timeline does not show my ticket in its previous sprint

[Prao]

I'm using the JIRA timeline to calculate hours of work in the project based on number of sprint that it is in [ie if it take 2 sprints, then I will just calculate by 10 days of work per sprint * 2 sprint * 8 hours of work per day]

I expect my highlighted ticket 515 to have the purple bar starting since sprint number 6 because this ticket overflow to the sprint number 7.

On the right, the ticket already has both sprint number 6 and number 7 added to Sprint field

I'm not sure if I understand anything wrong here

[yqiao]

I think the 515 doesn't show up on the sprint 6 because even though the Sprint field lists both Sprint 6 and Sprint 7, Jira’s timeline may only visually represent the issue in the latest sprint (Sprint 7).

This is standard Jira behaviour: the timeline does not show a bar spanning all sprints the issue was in, only the current/active one.