Menu dropdown not working after publishing

I am new to Webflow and have just finished making my first website on here but when I publish my website, the menu dropdown doesnt appear when the hamburger icon is clicked on. It appears in the preview though. I have tried all the solutions I have seen and none seem to work.

The published website: https://www.bullhornadvertising.com.au/
Here is my read only link: Webflow - Bullhorn Advertising