WP Engine is my webhost If you are on WP Engine, you need to contact WP Engine support and let them know that you want to whitelist the following QUERY ARGS & COOKIES to prevent caching. COOKIES utm_campaign utm_source utm_term utm_medium utm_content gclid first_utm_campaign first_utm_source first_utm_term first_utm_medium first_utm_content handl_original_ref handl_landing_page handl_ip handl_ref handl_url organic_source gaclientid //and all the custom parameters created by you QUERY ARGS utm_campaign utm_source utm_term utm_medium utm_content gclid //and all the custom queries you are capturing Usually, this process takes couple of hours to complete. Hoever, you may want to wait longer for changes to completely take effect. Still having problems? Let us know, clicking the chat bubble at the bottom right of the page.