Content-sidebar template size issues

Hello,

My default layout is sidebar-content-sidebar, but when I change the template on an individual page, to content-sidebar or sidebar-content, the sidebar shrinks dramatically in size. Here is an example: http://www.linguaplay.co.uk/testing-the-new-layout.

Also, before I started using dynamic widgets, changing to content-sidebar template would also force everything that was in the left sidebar, to the one on the right, creating a real mess.

Kindly point me in the right direction to fix these issues. Many thanks!