I have a website that is made with Twitter Bootstrap. On a large screen the navbar is looking nice as it should be but if you see the same navbar on a cellphone the navbar won\'
To add to dustbuster, I also had the issue and tried to load the JQuery first then the Boostrap but the issue didn't get resolved and noted another hint from the link below: -
https://www.freecodecamp.org/forum/t/solved-my-bootstrap-navbar-toggle-is-not-toggling/15222/20
To add the Bootstrap.min.js instead of Bootstrap.min.css. Please do not remove the Bootstrap.min.css when adding the js. Once both added, the issue was resolved.