Can't delete test issues with question mark as key, summary, and status

[Jonathan Mao]

Hi

A tester in our team flagged a problem where some Test issues appear with a question mark as the issue key, summary, and status. See embedded screenshot.

I'm a Jira administrator.

I can see the issues but can't delete them. Either by bulk selecting, or individually. The following error is displayed when I select delete:

"Error while adding Tests to Test Set. User doesn't have access to all the issues needed."

I've also included a screenshot of that.

Any help would be greatly appreciated.

Cheers

Jonathan