Clearing your browser cache is really important when you are working on your site. You should also make sure you log out of your sites regularly and clear your cache so it doesn't get corrupted. This can happen over time and cause you to see things no one else can.
To clear your browser cache in Chrome, please follow this guide.
To clear your browser cache in Firefox, please follow this guide.
To clear your browser cache in Edge, please follow this guide.
To clear your browser cache in Safari, please follow this guide.