HI,
Clear hard Reload your browser cache. This usually happens because of the browser cache. So first clear your browser cache.
http://prntscr.com/rvw401
If it does not work then Update your template and clear your Joomla and Browser cache.
It will be work
If anyone sees font awesome icon problem after template update like this:
http://prntscr.com/r0nx6o
then inspect the element and change the CSS font-family: "Font Awesome 5 Free" like this
that CSS is coming from the custom CSS file, you need to change that file CSS
http://prntscr.com/r0nxtb
By the way, don't forget to keep a backup when you update your template
-Best Regards