diff --git a/includes/tracks/class-wc-site-tracking.php b/includes/tracks/class-wc-site-tracking.php
index de0c1313775..d2550917d6f 100644
--- a/includes/tracks/class-wc-site-tracking.php
+++ b/includes/tracks/class-wc-site-tracking.php
@@ -68,11 +68,13 @@ class WC_Site_Tracking {
 			window.wcTracks.recordEvent = function( name, properties ) {
 				var eventName = '<?php echo esc_attr( WC_Tracks::PREFIX ); ?>' + name;
 				var eventProperties = properties || {};
-				if ( window.wp && window.wp.hooks && window.wp.hooks.applyFilters ) {
-					eventProperties = window.wp.hooks.applyFilters( 'woocommerceTracksEventProperties', eventProperties, eventName );
-				}
 				eventProperties.url = '<?php echo esc_html( home_url() ); ?>'
 				eventProperties.products_count = '<?php echo intval( WC_Tracks::get_products_count() ); ?>';
+				if ( window.wp && window.wp.hooks && window.wp.hooks.applyFilters ) {
+					eventProperties = window.wp.hooks.applyFilters( 'woocommerceTracksEventProperties', eventProperties, eventName );
+					delete( eventProperties._ui );
+					delete( eventProperties._ut );
+				}
 				window._tkq = window._tkq || [];
 				window._tkq.push( [ 'recordEvent', eventName, eventProperties ] );
 			}
diff --git a/includes/tracks/class-wc-tracks.php b/includes/tracks/class-wc-tracks.php
index bced1b0fe32..565ef7ccb17 100644
--- a/includes/tracks/class-wc-tracks.php
+++ b/includes/tracks/class-wc-tracks.php
@@ -98,7 +98,11 @@ class WC_Tracks {
 		$blog_details   = self::get_blog_details( $user->ID );
 
 		// Allow event props to be filtered to enable adding site-wide props.
-		$filtered_properties = apply_filters( 'woocommerce-tracks-event-properties', $properties, $prefixed_event_name );
+		$filtered_properties = apply_filters( 'woocommerce_tracks_event_properties', $properties, $prefixed_event_name );
+
+		// Delete _ui and _ut protected properties.
+		unset( $filtered_properties['_ui'] );
+		unset( $filtered_properties['_ut'] );
 
 		$event_obj = new WC_Tracks_Event( array_merge( $data, $server_details, $identity, $blog_details, $filtered_properties ) );