Hi,
Never used 2011 Theme, but it seems that something has changed in your header.php file.
Around line 131, there should be something like this:
<div class="skip-link"><a class="assistive-text" href="#content" title="<?php esc_attr_e( 'Skip to primary content', 'twentyeleven' ); ?>"><?php _e( 'Skip to primary content', 'twentyeleven' ); ?></a></div>
I don’t know how advanced You are in coding and if You have access to files, so to be clear and simple in Appearance->Editor on the right select header.php, scroll to the bottom and You should find line in question right away.
If there is another link inside that div, just delete it.
If not, I would search for some javascript in header, footer, some unidentified code in function.php etc.
Hope that helps a little bit…
Greetings
