First, refresh the page in your browser (F5 or Ctrl F5). Often pages get cached in your browser or on the web host's server and refreshing the page or forced refreshing of the page--Ctrl F5) will often bring up the most recent changes.

Another thing that frequently happens, though if your visitors can see the changes this will not apply to you, is if you published your site as index.html and then you forget to add the .html, Xara will export the same site as index.htm. .html takes precedence over .htm so even if you republish your site a bunch of times, the old index.html file will load.