We had two issues on our JIRA board that had the same key (MKT-2436). When selecting one, it would display the other (the "original" worked without issue). I deleted the "original" and now the duplicate issue is sitting in the backlog and can't be moved, deleted, edited, etc.
When selecting it, a red error dialog appears "Error Issue does not exist" and the URL http://jira..../MKT-2436 says the issue does not exist.
