Otherwise the cached version is delivered to the mobile user.
If you are experiencing an issue with Woocommerce stock being cached and therefore not updating, try updating to the latest version of Woocommerce.
This video shows you how to configure the Word Press Cache Enabler plugin.
header to help the browser determine whether the content has changed since the creation of the static cached file.
Caching in Word Press is an important factor to improve the overall web performance of your website.
As of version 2.5.2 the issue is resolved and the stock number no longer conflicts with caching plugins.