This seems to be a known issue for which a bug has been logged already. Here is a link
to the feedback portal where you can track the progress of the bug and vote to increase its priority.
I sincerely apologize for the inconvenience caused by this issue.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items