Some of the plugin scripts are completely missing from the page. Looks like it has something to do with the “siteground optimizer”. If you have something like that installed, check it’s configuration, it removes some essential inline scripts, which are neccessary for the plugin to load properly.
The plugin is compatible with any minify/cache plugin, you can use any of them – W3TC, WP Rocket etc.. The issue in this case was, that some scripts were simply removed. So there is very likely either a misconfiguration, or there is an issue with that minifier plugin.
When you configure a minify/cache plugin, make sure you don’t set it to remove any inline or any other scripts.