Misformatted html code can wreak havoc on any site design.
With so many people adding links, image links, div styles and other html code to posts and widgets, invariably bad code will get used.
If you see your sidebar drop below your posts, or the footer image appear at top of posts then chances are you have an extra div or "a" tag in your code.
Check all your the links or banner image codes you manually entered in Socrates layout fields or widgets.
Look for an extra or missing "a" tag. Every open <a> tag needs a closing </a> tag Every open <div> tag needs a closing </div> tag.
If there's no issue with your widgets or layout fields then the problem might be in a post.
Open each post in a new window.. the good posts will look normal, the bad post will look misformatted.
Edit that post and look for an extra or missing tag and that should solve the problem.