The ReaderView app re-loads the web pages that you have in "Favorites", "History" and "Recently shared" tabs every time the page is loaded from their original online locations, as the Safary browser does. If you want to preserve the page content locally in your device, "Lock" it is - so its main content file will be kept "offline" - use the "lock" functionality of the ReaderView App. The "locked" page is not possible to reload without "unlocking". But in case of dynamic, changing content it may be reasonable in some case to save the downloaded text locally.