Navigation menu not working on mobile

Hi,

I tried searching for relevant posts, but doesn’t seem to be able to fix this issue. My navigation menu is working perfectly fine on desktop and tablet mode, but not working on smartphone mode. The menu can’t be clicked on, when I’m accessing my website on my smartphone.

Is there any way to fix this?

Thank you very much in advance.

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