Wrong Display for Mobile, Tablet or Desktop
If you have issues with the mobile version of your site being shown to desktop users, or vice versa, make sure you have enabled the option to create a separate cache file for mobile devices. This is found on the Basic tab of the WP Rocket settings:
Now, for every page, you will have a cache file that will be shown to desktop users and a separate file that will be served to mobile users.
Wrong display for tablet users
WP Rocket's mobile detection treats tablets as desktop, not mobile devices.
Since there can only be two versions of the cache - desktop and mobile, if you have a specific display for tablets only, it's not possible to have a third cache file for that view. Currently, the only solution is to exclude those devices from the cache, based on the user agent.
In WP Rocket's Advanced tab, locate the field labelled, " Never send cache pages for these user agents", and add the following list (one per line):