My bootstrap in ASP.NET MVC is up-to-date (v4.1.3). When I use dropdown components, it does not work properly!
Then I use: and comment out @Style.Render(~/Content/css)
It goes like this:
How could I fix this? (I have checked carefully the version of bootstrap in Content folder. It have no problems. As the same as the latest one I download from getbootstrap.com

