this started a couple of weeks ago. whenever i try to visit certain websites it will only load old versions of the page, and when i try to follow permalinks to pages after that old version, i get 404 errors. this wasn't a big deal at first because it was only a couple of websites, but it's coming up more and more

i tried clearing my cache and using different web browsers and it didn't work. i've been searching googles to no avail, does someone know what's wrong with it?