Why would an issue transition remove an issue from the sprint while the sprint field is still there

[goliath]

I had an issue in my "Code Review" state, then my Pull Request in Bitbucket was merged which would cause the issue to go into the "In Testing" state.

When the issue's status got changed to "In Testing", the issue was no longer in my sprint (moved into the backlog), however that issue's sprint was set to my current sprint.

[Lenin Raj]

HI @goliath 

The issue could have been moved out of the sprint for various reasons. Can you go that relevant ticket and look at "History" (next to Comments) and see what has triggered this change?

[goliath]

I see the Automated transition triggered to change the Status but nothing after that.