Currency switcher doesn’t work on mobile (Shortcode in header menu)

Hello,

I inserted the currency switcher in my header menu via shortcode. It works fine on desktop:

http://prntscr.com/vijvla

But it creates a problem on mobile:

http://prntscr.com/vijz9a

The dropdown is being cut off and the currencies from the part that is visible don’t react when tapping them.

Is there a way I can solve this problem?

Cheers,
Andi