I'm not sure about the oddity in the admin but looking at the published page it appears the culprit might be the Google Docs survey. The width in the iframe code is too wide to fit into the default column width for a post on this page. You might want to try making some adjustments to this or use a different page template. I'm not familiar with using Google Docs so someone else might be able to give you some better direction.
Here's the code I see in the page source:
The column width might be something like 540 so if you change the "760" above to that or something close, it may work. Worth a try.
Also one thing to remember is if you are adding code (rather than plain text) to a post, make sure you are in the HTML tab and not the Visual tab.