Hi Pete, this usually happens because both the theme and the quiz plugin are calling the featured image. The quickest fix is to hide one of them with CSS. You can try adding this to Appearance → Customize → Additional CSS:
.single .wp-post-image {
display: none;
}
This will remove the default featured image output at the top, while still keeping it available for thumbnails or social sharing. If you only want it disabled on quiz posts, you’ll need to target that specific post type/class instead.
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