Dropdown/submenu items issue on mobile display

Hi!
My first post here.
I'm a Gridbox newbie after many years with the (now dead...) Gantry 5.
This is my website URL (now in a subdirectory):
https://www.educationmartialarts.com/ema2025

On the two menu items:
1) MISSION AND OBJECTIVES
2) ORGANIZATION

...my client needs two dropdown.

Unfortunately the items inside the dropdowns do not work properly on Phone display.
At this moment the menu items in the dropdowns are linked to different ANCHORS in the same Gridbox page. But the menu do not wotk properly on mobile display.

Can you help me to solve this problem.
Thank-You!

Ettore

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