Display of all posts by author not working when Search & Filter Pro is active

I am using the search and filter pro plugin to enable advanced search on my site. When the search and filter pro plugin is active, All the posts by author are not displaying, If I click on a author name and go to the author page, there are no posts including custom post types.

But If I deactivate the search and filter pro plugin, the posts are all displayed.

Same goes for pagination too if I can create a custom query and use pagination and click on page 2, I get not found page but if I deactivate the search and filter pro plugin, the pagination works again.

I am so stumped why this would be happening. The only reason I can think of is that both Enfold theme and Search & Filter pro might be using the same syntax for $query.

Any help is appreciated as I am stuck at this from last 4 days

Below is the code I am using in author.php through custom query

$paged = get_query_var('paged') ? get_query_var('paged') : 1;
$args = array(
    'post_type'    => array( 'volunteer-position' ),
    'post_status'  => array( 'publish' ),
    'author'       => get_queried_object_id(),
    'posts_per_page'     => 6,
    'paged'              => $paged,
    'order'              => 'ASC',
    'orderby'            => 'title',
  );

// query
$custom_posts = new WP_Query( $args );

// the loop
if ( $custom_posts->have_posts() ):
    while ( $custom_posts->have_posts() ) : $custom_posts->the_post();

// displaying the posts content here 

<h2 class="post-title entry-title " itemprop="headline">
              <a href="<?php echo get_permalink($post->ID); ?>" rel="bookmark" title="<?php echo get_the_title($post->ID);?>"><?php echo get_the_title($post->ID); ?><span class="post-format-icon minor-meta"></span></a>
           </h2>

endwhile;
    
     // using wp-pagenavi as AVIA_PAGINATION not working at all

       if (function_exists('wp_pagenavi')):
          wp_pagenavi(array( 'query' => $custom_posts ));
      endif;

  else:
    // nothing found
endif;

// Restore original Post Data
wp_reset_postdata();