Emberjs renders the wrong template in a nested route

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

application.template.hbs

<br>
<br>
{{outlet}}
<br>
<br>

comment.edit.route.js

import Ember from 'ember';

export default Ember.Route.extend({

model: function(params) {
 console.log(params);
 return params;
}

});

comment.edit.template.hbs

Comment Edit Page

<br>
<br>

Comment Id you passed is {{model.comment_id}}.

<br>
<br>
<br>
<br>

{{link-to 'home' 'home'}}

comment.index.template.hbs

Comment - Page

<br>
<br>
<br>
<br>

{{link-to 'comment - edit - page' 'comment.edit' 12121}}

<br>
<br>
<br>
<br>

{{link-to 'home' 'home'}}

home.template.hbs

<h3>Home Page</h3>

<br>
<br>

You can go to comment page

<br>
<br>

{{link-to 'go to comment' 'comment'}}

<br>
<br>
<br>

You can go to comment edit page 

<br>
<br>

{{link-to 'go to edit - comment' 'comment.edit' 10001 }}

router.js

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {

  this.route('home', {path:'/'});
  this.route('comment', function() {
    this.route('index', { path: '/' } );
    this.route('edit', { path: '/:comment_id' });
  });

});
export default Router;

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}