The problem is caused by “opacity: 0;” – https://prnt.sc/n5qq3d in styles of the plugin. Contact the plugin authors to sort it out.
We are theme support and are able to help with problems strictly related to our theme only. If you have any problems with an additional plugin, I would recommend you to send a request to the author of that plugin. Also, we don’t give guarantee for full theme compatibility with all 3rd party plugins.