Never Cache User Agent(s)
The option is used to prevent cached and optimized pages from being served on certain devices and in certain browsers.
The User-Agent request header is a string that lets servers identify the operating system, vendor, and/or version of the browser that accesses a page.
You can exclude certain User-Agents from being served cache by adding the string value in the Never Cache User Agent(s) text area in the Advanced Rules tab:
Mobile/15E148 Safari/604.1 string can be added as:
Exclude a specific browser as in the example:
Add a device name as in the example:
Wrong display on tablet
Please see the article for possible solutions: