Thank you for providing your live URL – it is very helpful!
I see that you’re using ‘Essential Addons for Elementor’ plugin.
It hides all spans inside menus for mobile devices for some reason.
You can override it’s styles by adding this CSS code snippet into your Customizer – Additional CSS section:
.elementor-widget-eael-simple-menu.eael-hamburger--mobile.eael-hamburger--responsive .eael-simple-menu-container .eael-simple-menu.eael-simple-menu-horizontal li a span, .elementor-widget-eael-simple-menu.eael-hamburger--mobile.eael-hamburger--responsive .eael-simple-menu-container .eael-simple-menu.eael-simple-menu-vertical li a span, .elementor-widget-eael-simple-menu.eael-hamburger--tablet.eael-hamburger--responsive .eael-simple-menu-container .eael-simple-menu.eael-simple-menu-horizontal li a span, .elementor-widget-eael-simple-menu.eael-hamburger--tablet.eael-hamburger--responsive .eael-simple-menu-container .eael-simple-menu.eael-simple-menu-vertical li a span {display:block;}
For your ExS Music theme and Elementor conflicts – once again – it is very hard to tell something without looking onto your staging site.
There is no something special about ExS Music theme in comparison with other our themes so we need to take a look on it.
Please let me know if this helps.
Best regards!