Responsive Menu on "[Plugin: Responsive Menu] 3rd level menu items hidden"

3rd level menu items are not expanding on my mobile device.
Jewellery > Brands> the list of brands dont show?

Works fine on my desktop when i minimize my window to mobile view.

https://wordpress.org/plugins/responsive-menu/

calgaryjewellery.com

Hi there,

I just checked on my mobile and desktop and can see them fine.

Alor, Breuning, Charles Gaier etc.

Please advise?