Hello, @Nick,
Please tell me which element you used for that Perspective dropdown in the header and which you used for the hover and modal effect, OR you used Custom Code for it?
I can see you are using the Child Theme on your site, have to try to switch and checked with the Parent Theme?
OR you have used any third-party plugin for it?
Please share the name of the plugin and URL also I need your site WP Admin Login details in the private content area of this topic as below listed format, so that I will check it for you and help you out if possible.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Note: I need the debugging on your site as well, which includes deactivating all the third-party plugins and on-site Customization as well, so please take the complete backup of your site and share the permission OR clone your site and share that with me.
Regards 8Themes Team.