Sidebar Moved and Distorted On Several Pages

I recently changed my comments template on my theme, but for some reason, it now distorts and moves the sidebars to the bottom the page. The content disappears, leaving only the yellow bars that represent my widget titles.

Some of the pages still work fine, and some pages show this distortion. The main index page is fine:

https://cg.dearisobel.org

but

https://cg.dearisobel.org/stories/

Shows the distortion.

I’ve checked for width problems, and haven’t found them. I validated my markup (and while I have a lot of errors I need to clean up, I can’t seem to locate any missing div closing tags.)

I would appreciate any assistance.