Posts are not kept on top when I display posts in grid layout

can you try this in your child-theme functions.php:

function sticky_posts_first($query, $params) {

  $include = array();
  $sticky = get_option( 'sticky_posts' );

  $args = array(
  'post__not_in' => $sticky,
  'orderby' => 'title',   // here you can influence the orderby option of the non sticky post to your needs 
  'order'	=> 'asc',    //  the order of the non sticky posts
  'numberposts' => -1  	 // -1 for all - that number is for the non sticky posts  
  );
  $posts = get_posts( $args );

  foreach($posts as $post) {
  $include[] = $post->ID;
  }
  if ( !is_sticky() ) {
    $include = array_merge($sticky, $include);
  };

  $query['post__in'] = $include;
  $query['orderby'] = 'post__in';

return $query;
}
add_filter('avia_post_slide_query','sticky_posts_first', 10, 2);

but that is only for the enfold blog posts ALB

PS for those params you can have:
orderby: ‘title’, ‘rand’, ‘date’, ‘author’, ‘name’, ‘modified’, ‘comment_count’, ‘menu_order’
order: ‘ASC’, ‘DESC’

that part:

$args = array(
  'post__not_in' => $sticky,
  'orderby' => 'title',   // here you can influence the orderby option of the non sticky post to your needs 
  'order'	=> 'asc',    //  the order of the non sticky posts
  'numberposts' => -1  	 // -1 for all - that number is for the non sticky posts  
  );

is only for the non sticky posts – and changing the orderby to: ‘title’, ‘rand’, ‘date’, ‘author’, ‘name’, ‘modified’, ‘comment_count’ or ‘menu_order’
does not work ?