When I click the link on my dashboard to get to the current sprint I get 2 pop-ups containing what's in the title of this question.
The problem seems to be that the link is missing a name-value pair.
I'm guessing programmatically it's trying to re-select an issue I was viewing previously.
An example of a URL that causes the two pop-ups (the selected issue is not exclusive)
[my.company]/jira/software/c/projects/IT/boards/83?selectedIssue=IT-754
the problem seems to be it's missing the "&view=detail" portion. As once I manually add that the pop-up doesn't occur.
It's not a show stopper by any means - just a little annoyance.