Looking at the HTML codes that you have and comparing it with the Bootstrap site seems to show that you might have been using it differently. As you can you can check here:
That drawer icon actually only shows when viewed in a small screen. Plus, it uses an HTML NAV element as the root. Most of the example uses NAV. For the above, if you want to show a button, you can alternatively use a font-awesome icon instead and just place it beside that title if you want to.
Otherwise, that button was supposed to replace all the other menus / navigations from:
Where if you now click on that drawer/toggle icon, it was suppose to show: