CSS changes in MVC app not working

I have created an MVC application using VS Express for the web. It will only use the default inline CSS file that VS Express ships with.
Example: If I change the bootstrap.css file (change the jumbotron color) and run locally from VS, the changes are obvious, however, when deploying to the web, none of these changes are obvious. I also noticed that when I change the web.config file to Debug = false, the CSS changes I made are not explicit when I run it locally from VS (and when deploying to the web).

The CSS is still being applied however any changes I make are not being applied. The site shows the old default jumbotron color. If I change debug = true in web.config then jumbotron shows my updated color. When I deploy the website to my site, none of the CSS changes are applied, it still uses the default CSS file, I even checked bootstrap.css on the server and it shows the updated jumbotron color, but the jumbotron is still the standard color on the Internet ?? Super embarrassing.

I did a lot of reading, tried adding the following to my web.config:

<remove name="BundleModule" />
<add name="BundleModule" type="System.Web.Optimization.BundleModule" />

      

        
        
        
      

    

but that doesn't fix it. I tried to remove the .css from my filenames, this fixed the problem when I run it locally from VS using debug = false, however, when publishing the site, the site does not show any CSS styles at all. This is not a caching issue. It has something to do with grouping and debug = false, but I don't know what. I am still new to web / MVC development. I have updated my web.optimization and microsoft.aspnet etc. With NuGet.

This is very difficult for me, if someone has a suggestion and it works, I will be very happy! There are many posts about this in Stack Overflow, but none of the suggestions have worked for me yet.

This is my bundle.config.cs file:

using System.Web;
using System.Web.Optimization;

namespace HFHYYC
{
        public class BundleConfig
        {

        public static void RegisterBundles(BundleCollection bundles)
        {
            bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                    "~/Scripts/jquery-{version}.js"));

            bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
                    "~/Scripts/jquery.validate*"));

            bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
                    "~/Scripts/modernizr-*"));

            bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include(
                  "~/Scripts/bootstrap.js",
                  "~/Scripts/respond.js"));

            bundles.Add(new StyleBundle("~/Content/css").Include(
                  "~/Content/bootstrap.css",
                  "~/Content/site.css"));
        }
    }
}