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Hi @lennox2017,

There are a number of CSS issues regarding our plugin happening on your site and they are being caused by WP Rocket. You can confirm this by using the ?nowprocket added to the end of your URL’s, for example: https://www.groeneluxe.nl/lappenmos/?nowprocket

WP Rocket can cause a number of problems based on configuration, they have dedicated articles to work through and resolve issues like yours, please take a look at https://docs.wp-rocket.me/article/106-my-site-is-broken which is the main introductory article. The specific issue in this case is I believe the “Remove Unused CSS” feature, here is the associated troubleshooting article https://docs.wp-rocket.me/article/1718-troubleshoot-remove-unused-css-issues. WP Rocket has removed a lot of our plugins CSS which it thinks is not needed but actually is. I recommend “safelisting” FooGallery’s CSS file to prevent WP Rocket from touching it entirely.

Thanks
Steve