Custom post types not imported properly

I’ve registered a custom post type:

function create_gallery_post_type() {
  register_post_type( 'sim_gallery',
    array(
      'labels' => array(
        'name' => __( 'Sim Gallery' )
      ),
      'public' => true,
      'has_archive' => true,
      'menu_position' => 10,
      'description' => "Post for displaying gallery"
    )
  );
}

Now I’m trying to import the content from my staging server to my dev server.
During the import process, I get the feedback that it failed to import all my custom post.

So clicking ‘Sim Gallery’ in the left navigation panel, shows zero posts.

But if I look at the database, wp_posts, I can actually see the posts.
If I try to create a post with a name that is already registered, I get somename-2 where -2 indicates that a post by the same name is already registered.

So my question is:

1) Why does the wp import function say that it failed to import my cistom posts?
2) Why are my custo mpost not shown in the post listing in the backend?