Google has identified a known issue in their latest version of Chrome 31 that causes embedded Visualforce pages to display incorrectly in Salesforce, including incorrectly displayed fields, sections, or columns. Google is currently working on a patch to correct the issue, and we are working closely with them to ensure it is corrected as soon as possible. The known issue is posted on Google's Known Issues site here: https://code.google.com/p/chromium/issues/detail?id=308402
If your browser has already updated to Chrome 31, you can use an alternate browser such as Firefox or Internet Explorer until Google releases the patch update to correct the issue.
If your browser has not yet updated to Chrome 31, you can disable automatic updates in Chrome and remain on the older version where this issue is not occurring.