Wrong layout for certain posts only

In some (but not all) of my posts, here’s what happens:

1. The headings in my right sidebar do not obey the standard style
2. The blue border enclosing the content encloses only the header (image on top of page) rather than the whole content
3. The thickness of the border underneath the header image is thicker
4. The blue background that starts on top of the page bleeds into the content area

Here’s an example of a well behaved post and a poorly behaved post if you’d like to see this in action:

Good Post: https://ashpics.com/blog/2007/07/22/life-in-the-biorb/
Bad Post: https://ashpics.com/blog/2007/04/26/how-to-sleep-at-work-and-not-get-caught/