Problem with "email story" box on Safari

I have a problem I've spent a lot of time on and have found no way to fix it. Need some help.
On the Mac, when using Safari, the box that opens when email is clicked next to a story, cuts off half the height of the email address. Chrome and Firefox work fine. I've attached a grab of the box to show what is happening on Safari. Any ideas?

Hi

Please tell me the url to the exact page with an example of this issue.