I'm starting a new project with asp.net mvc4 internet application.
First thing I did was install a package called Twitter Bootstrap for Asp.Net MVC 4 Sample via nuGet.
This installed other two packages Bootstrap and Twitter Bootstrap for Asp.Net MVC 4.
When I run the application,I get this

I didn't face this problem in previous projects. When I installed twitter bootstrap, things were fine when i built the application.
Can anyone explain or suggest, what might be going wrong?
Edit 1:
I have another project where bootstrap works fine. When I run the two projects in chrome and check the network, file that are loaded for both the projects are same.
css/js files loaded perfectly?. See Network tab of chrome built in fiddle tool(Press F12) or FireBug for Firefoxhttp:orhttps:. Many CDNs provide scripts with the protocol missing like<script src="//ajax.googleapis.com/ajax/libs/ext-core/3.1.0/ext-core.js"></script>for example.