Tooltip "Link to this post" is located incorrectly

Preconditions:
User should not be logged in

Steps to reproduce:
Go to any topic/code review/poll, move the cursor to "Link to this post" button (upper right corner of the post)

Actual result: the tooltip covers the button, so that the user can't press the button (please, see attachment Inconvenient tooltip_Opera) - only reproduces for Opera and MF
Expected result: the tooltip should be shown in a convenient place as it is in Chrome 26.0.1410.64 m. (please, see attachment Convenient tooltip_Chrome)