Some posts showing up outside column

Hey, all the sudden my blog went crazy on me, I didn’t even change anything.
check it out:
https://youknow4kids.com/paulblog/
The sidebar went all the way down to the bottom on the main page, and I spent a while trying to figure out why, and realized that some of my posts, all the ones under the post titled “Blog Blog Blog” all the sudden became centered in the middle of the page instead of the middle of the column. It’s happining with all the different themes I’ve tried. It’s only with those posts too. If I go to a page of earlier posts, like here

everything is fine.