Mega Menu Issue on Mobile (Bug?)

Hi,
i've created a mega menu on my site "Alan Adı (Domain)
But when i visit it from my iPhone it does not work and the link does not show anything.
Please take a look at wpbulls.com
In the primary menu you will see "Alan Adı (Domain)
On the Desktop version it's working fine but on mobile it does not work.
Don't try it by resizing the browser screen. You must test it on mobile.

Thanks!