Sidebar has vanished.

the report of the https://validator.w3.org/ might give you some hints.

does the content suddenly end in a certain post?

does this also happen in single posts and/or pages?

can you post a link to your site?

Twenty Eleven does not show a sidebar on single posts and pages;

if that is not your problem, and your sidebars disappear otherwise, please post a link to your site, and provide more details.

femalefriends dot co dot uk. Thanks.

nothing wrong with the theme Twenty Eleven – that is the way it is designed.

if you want to have a sidebar on single posts and pages, follow my instructions in https://www.transformationpowertools.com/wordpress/twenty-eleven-sidebar-on-single-posts-and-pages

or select a different theme.