LindsayKB on "[Theme: Parabola] Sidebars stretch across the page! How do I fix it?"

On certain pages, my sidebars stretch across the page and across the main content. On other pages, it's perfectly fine. I tried re-creating the trouble pages but I found the same problem. Help?

Examples:
Correct:
http://youngbway.org/les-miserables/

Wrong:
http://youngbway.org/the-lion-king/