Are you accessing the site through a shortcut on your desktop or through a favorites shortcut? One time my shortcuts went on the fritz and would not load the most recent version of a website, even if i refreshed...
To fix it I had to reformat my comp, im sure there is a simpler way to fix it but im not a techy kinda guy so i wouldnt know lol. But at the time my comp was fairly new so i had no problem backing everything important up. But if you have alot of stuff you need to keep I would look into another fix.
I hope this helps. GL