Why clearing or refreshing your cache?
Your browser has a folder in which certain items that have been downloaded are stored for future use. Graphic images (such as buttons and icons), photos, and even entire web pages are examples of items which are saved or cached. When visiting a webpage your browser checks if a copy of the files on the page is in its cache already. If so, it will save the visitor some downloading and make webpages load faster. Some browsers refer to their cache as Temporary Internet Files.
Cache refresh
How to clearing Cache/cookies in Chrome.
How to clear Cache/cookies in Firefox.
How to clear Cache/cookies in Edge.