Mobile menu not opening on specific page

This is my first Webflow site and the mobile menu is working on all but 1 page. I have tried playing around with the z-index values and ensured that ‘overflow’ is set to scroll. Settings seem to be the same across the nav bar on all pages as it is set up as a symbol. Can anyone suggest why this might not be working on a single page?

Here is my read-only site: Book a Demo | MyCube |Temperature Monitoring

With thanks,