It appears that you have a "Virtual Path" set up on your development server.
so - assuming that you're using Visual Studio's built in server. If you click on the root of your web site in the "Solution Explorer" panel on the right, then Right-click and choose "Properties Window" you will see the properties of your dev site. It looks as though you have a name in "Virtual Path".
you don't have this setting on your production enviroment.
If you prefer, set the virtual path in VS to "/" - it will then match your production environment.
If you want it so that your production environment has the virtual path then see this tutorial (assuming IIS 7)