Restricting non admin to Dashboard

There is a situation here. I’ve tried the following code to prevent the non admins to access the dashboard.

add_action('admin_init', 'no_mo_dashboard');
function no_mo_dashboard() {
  if (!current_user_can('manage_options') && $_SERVER['DOING_AJAX'] != '/wp-admin/admin-ajax.php') {
  wp_redirect(home_url()); exit;
  }
}

and this as well..

function baw_no_admin_access()
{
if( !current_user_can( 'administrator' ) )
wp_redirect( home_url() );
die();}
add_action( 'admin_init', 'baw_no_admin_access', 1 );

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Both codes are doing what they are supposed to. But one unusual behavior I noticed that the non admins are not able to post anything. Neither any posts nor any comments of non admins are posted. What’s wrong ?