Menu location not showing chosen menu

Hi,
I’m building a child theme (I’ve troubleshoot-ed, it’s not the parent theme) and registered my own menu because I was having trouble styling the original one (for some reason). It simply displays ALL pages instead of the pages listed in the menu I assigned to it in admin.

Can someone look over my code? What am I missing?

In functions.php

function register_my_menu() {
  register_nav_menu('top-menu',__( 'Top Menu' ));
}
add_action( 'init', 'register_my_menu' );

In the theme
<div id="top-nav"> <?php wp_nav_menu(array('theme_location' => 'top_nav', 'container' => '')); ?> </div>

Much thanks