@alan-crawford,
No issues were found here. You just need to enable the "Show reCaptcha badge" option. Please watch this video: https://www.screencast.com/t/SXIphfWwzAXw
I may suggest you use this CSS code to make the badge displayed above the other elements: https://www.screencast.com/t/RqDo45s1
.grecaptcha-badge {
z-index: 9999999 !important;
}
Put the code in the "Custom CSS code" textarea, located in the Dashboard > wpDiscuz > Settings > Styles & Colors admin page.
Please press CTRL+F5 (twice) on the frontend before checking. When you enable the cache plugin again, don't forget to delete all caches.