You are not alone and you are not crazy. This is just your browser doing its job. Internet browsers, such as Internet Explorer and Firefox, download all of a web page's files when you visit it. That way, the next time you visit that same site or page, the browser can use the downloaded files to load the page faster. This process is known as caching and it means that sometimes when you go to check your updates, you'll find that the browser is still displaying the old, downloaded files, rather the new ones.
Option 1: The answer may be easier than you think. Often, you can simply Refresh the page (on the public side, not in QuantumCMS) by clicking the Refresh button or pressing F5 or CTRL + R (CMD + R on Mac) on your keyboard.
Option 2: You can force the browser to reload the page from scratch (without drawing on downloaded files) in most browsers by pressing CTRL + F5 (CMD + F5 on Mac) on your keyboard.
Option 3: If all else fails, you can manually clear your browser's cacher and reload the page using either of the previous two options. See below for instructions.