Hi there,
I tested the page without WP Rocket ( by adding the ?nowprocket query string to the URL ) and the accordions work. The Theme has nothing to do with it, you need to speak to WP Rocket or the Accordion plugin authors support.
For some general guidance you can try to eliminate which setting in WP Rocket is causing the issue by disabling each setting one by one. I would recommend doing this in an Incognito/Private browser so there are no browser caches getting in the way.