Sometime you PC or browser can 'get itself into a state' and not communicate the right data to the site. Other people may be able to get things to work correctly on their PCs, but you can't. This looks like a problem with the site but the problem really lies in your PC

We don't normally do support for your own desktop PC or for Microsoft's own desktop products (it is a different and endlessly complex specialization) but in this case

1. If you have installed any type of accelerator software and are getting inconsistent results from your browser you will need to disable it.
2. Then you can try clearing your browser cache, and cookies
1. Microsoft tell you how to do this at http://www.microsoft.com/windows/ie/ie6/using/howto/customizing/clearcache.mspxFor firefox
2. For Firefox
1. Clear all cookies. In Firefox " Options: "Privacy -> Cookies -> Clear Cookies Now" (Firefox 1.5 and earlier) or in "Privacy -> Show Cookies -> Remove all cookies" (Firefox 2.0). In Mozilla Suite preferences, under "Privacy & Security -> Cookies -> Cookie Manager".
2. Clear the cache: In Firefox Options: "Privacy -> Cache -> Clear Cache Now" (Firefox 1.5 and earlier) or "Advanced -> Network -> Cache -> Clear now" (Firefox 2.0). In Mozilla Suite preferences, under "Advanced -> Cache -> Clear Cache". 
3. Then restart your computer.