In the Options settings of your browser, whatever it be, there is a setting where you can choose to have it download every time or not, it's related to the cache settings as most browsers will just draw it again from the cache unless the cache is empty or it's been a long time since being refreshed. You can also do a forced refresh by hitting the F5 button to refresh that page from the Internet.
Now that you're looking beyond your system, many ISPs save themselves some money by having a server where they keep cached files of web pages frequently used b y their clients for a time period. It's possible that when you ask for a new download you may get that cached page.
If you're having trouble with page and think it's an old copy it's often best to go into your browser options and empty the cache first - this is known as clearing the cache. Then it has no option but to get a new copy from the Internet.
BTW questions like this should be over in the Q & A area, not the discussion section. Minus one for wrong location.
Keep Up with TechRepublic