I am trying to integrate a bootstrap template into an application rails 4.2.1. When I check some element to see its css file and line number in the browser developer tool, it should show the css file and line number, as shown below:

Instead, it shows something like below:

I reviewed the problem and found that it generates an additional three styles, as shown below:

Here's mine application.html.erb:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<title>title</title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
</head>
<body>
<%= yield %>
</body>
</html>
and application.css
*
*= require_tree .
*= require_self
*/
and application.js
All cssand jsfiles are included in folders stylesheetsand javascriptsaccordingly
Does anyone know what's wrong here?
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