Bug: Editing email in Leads

In the Lead view there is a bug - most fields you can move the mouse over and an edit button shows up, but for the Email field IF THE EMAIL ADDRESS IS LONG, the edit button shows up when you hover over the email address itself. If you try and move back over the Edit button it disappears.

For example if the email address is
xxxxx@xxxxx.xxx it works fine
xxxxx.xxxxxx@gmail.com it doesn't