Menu toggle button not working on mobile

The toggle menu doesn’t work on mobile. Specifically on iPhones.
I’m running Neve with a few plugins, however disabling all plugins didn’t make a difference. I am running a clean installation of Neve on another website without any plugins and it still has the same issue, check it out:
https://www.yourwatercloud.co.uk (plain neve installation – no plugins)
https://www.imberwaterdistillers.com (main website with plugins)

The page I need help with: [log in to see the link]