Sometimes UI(user interface) issues can have various affects on the Teapplix system. When you need to clear the cache, please follow the pages below to do so:
Chrome: https://support.google.com/chrome/answer/95582?hl=en
Firefox: https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
IE: https://kb.wisc.edu/page.php?id=15141
Safari: https://guides.instructure.com/m/4214/l/60429-how-do-i-clear-my-safari-browser-cache