Thanks!
I will check it.
Unfortunately, it is the hosting service-provided caching plugin, directly tied to their security dashboard. Siteground is a recommended hosting provider in the WordPress community.
Any thoughts on what might cause a conflict with 8theme’s Xstore theme?
I should add that, starting out with just the SG Optimizer, a standard install of WooCommerce, and the Xstore theme, this setup didn’t cause any issue and my product page looked fine…