Please deactivate all the third party plugins and activate only the theme required plugins and then check the issue, I am sure your issue will be solved.
Otherwise, send me the WP admin login details of your site and give me the permissions to debug then we will troubleshoot with the theme plugins and solve your issue.
Sorry but I haven’t deactivated any plugin and tested on your site. If you want to find the plugin which is causing the issue then remove the CSS I provided and try deactivating the plugins and activate one by one to find the plugin which is causing the issue.