Hi,
This was brought up at least once before -- quite a while ago, admittedly. I think it was Vlk who explained that in the process of setting up an update, top priority goes to uploading to the servers, etc., and updating the web page is the very last thing to get done.
Admittedly this can be a nuisance if you're trying to use the links to do "manual-manual" updates, as opposed to being able to check using the program itself, but at least hopefully it explains the order in which things get done.
Best,
Mike