Why WP_Query with the same arguments retrieves different results?

Question

 wp_reset_query();
 wp_reset_postdata();
 $post = null;
 $course_args = array(
     'post_status' => 'publish',
     'post_type' => 'course',
     'posts_per_page' => 5,
     'order' => 'DESC',
     'orderby' => 'date',
     'tax_query' => array(
         array(
             'taxonomy' => 'course_cats',
             'terms' => array($category_id),
         ),
     ),
 );
 $course_args['meta_query'] = array(
     'relation' => 'AND',
     array(
         'key' => 'type',
         'value' => array('type1'),
         'compare' => '=',
     ),
 );
 $query_courses = new WP_Query($course_args);

Request "SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) WHERE 1=1 AND ( wp_term_relationships.term_taxonomy_id IN (1835) ) AND ( ( wp_postmeta.meta_key = 'tip_kursa' AND wp_postmeta.meta_value = 'paid' ) ) AND wp_posts.post_type = 'course' AND ((wp_posts.post_status = 'publish')) GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 1"

I have disabled all plugins except ACF, it is filtered by its field. Disabled function.php and all the extra code.