I have reviewed that most of the opencart users are getting cache issue on 3.x versions.
Even i was also facing cache issue such as updated cart and design updated issue.
I have found a solution to fix the same. You can add below code into the htaccess file it will fix your issue.
Code: Select all
<IfModule mod_headers.c>
Header set Cache-Control "no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires 0
</IfModule>