The auction pages try to check back with the server at regular intervals, but sometimes it isn't enough to keep your page updated quickly enough if your computer is slow or has a bunch of things running. This is especially true if your Internet is temporarily saturated as I mention above.
Internet Explorer is the WORST. It is complete and utter bloatware, especially after you get a few of the toolbars installed. I would highly recommend using Firefox or Chrome for your auctions.