It sounds like your browser may be "caching" your webpages.

In other words, sometimes your browser will store an old copy of your webpage (unbeknownst to you) and show you an older page that doesn't reflect your latest changes.  Browsers set this up so that they can pull up pages from your computer (faster) rather than from the internet (slow).  But sometimes the old copy of the page isn't the latest one... and that's when problems like this occur.

You can quickly and easily change your browser to be more well-behaved.   Here's what you need to do:

Refresh and Reload

First try pressing the Refresh button on your browser ("Refresh" for Internet Explorer, "Reload" for Netscape, Opera, etc). 

If this doesn't work, try a "hard" refresh by holding the SHIFT key and then pressing the refresh button.

Advanced - Changing Your Web Browser Settings:

Now, go to the Xanga page that's not loading your latest data... and hit refresh.  The latest updates should appear! 

• In Microsoft Internet Explorer, click TOOLS then click INTERNET OPTIONS...
  (or on old versions click VIEW then INTERNET OPTIONS...).
  In the 'General' tab, there is a heading 'Temporary Internet Files'.
  Click the 'Settings...' button.
  Where is says 'Check for newer versions of stored pages:',
  choose 'Automatic' if it exists. If not choose 'Once per session' or 'Every visit'.
  
• In Firefox, click TOOLS then click OPTIONS.
  Open the Privacy icon on the left and click CACHE
  then press Clear.
  
• In Netscape Navigator, click EDIT, then PREFERENCES.
  Open the topic ADVANCED, and click on CACHE.
  See 'Document in cache is compared to document on network:'.
  Click 'Automatic' if it exists. If not choose 'Once per session'.
  (Avoid clicking 'Every time').
  
• In Opera, click FILE, then PREFERENCES, then HISTORY and CACHE.
  In the box labelled 'Check Modified', for DOCUMENTS, IMAGES and OTHER, choose some number of hours or days (and avoid choosing 'Always').
  

Internet Service Provider Cache

Although this is rare, in the same way that your web browser caches, your Internet Service Provider may be caching pages on your behalf as well.  In this case, the best thing to do is contact your Internet Service Provider and they should be able to walk you through in fixing the issue.