php - WordPress pre_get_posts ordered randomly is duplicating the posts -


im using pre_get_posts in wordpress display custom post type posts in random order. kinda of working duplicates of posts meaning end 2 of same post when click load more. on refresh posts duplicated changes. way make doesn't duplicate posts?

below i'm using in functions make randomly display. 

    function artist_random_display( $query ) {     if ( $query->is_post_type_archive( 'artist' ) ) {         $query->set( 'orderby', 'rand' );     } } add_action( 'pre_get_posts', 'artist_random_display' );

there nothing wrong function , need add condition on page displaying custom post.


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