Mobile max mega menu only shows the 3 lines, not the menu: why?

why does the mobile version of max mega menu only shows the 3 lines and not the menu?

Hi guys ??

I’m newby and not skilled, i try to create my wordpress website https://www.cfsystem.it

I’ve got ASTRA and max-mega-menu, the “PC menu” is regular and it’s possible to see and navigate, instead the mobile menu only shows the 3 lines but when you click on it?nothing appears?… ??

Could you help me to fix this problem? Where am I wrong? What are the parameters I’ve missed?