Don’t suppose you tried to do that on an actual mobile? Access the link via safari or chrome and the problem occurs.
It works within read-only however it does not when accessing the site for real. Please use this link https://nuclyus.webflow.io/ on mobile. See below for video of the bug in action.
We both have similar cases.
We have hover on desktop and click on mobile .
So what was happening, the hover was conflicting with the mobile click, so as soon as the mouse pointer shifts from the nav item on mobile, it closes due to hover trigger.
In your case, the hover Interaction is set on all the devices, remove it from mobile or tablet on which you have hamburger menu.
In my case, I had it applied on element instead of class, so it was occurring on all the other pages as it wasn’t able to filter off the mobile devices.