can't access drop-down menu from main menu

i would like to ask why is it i can’t access my drop-down menu from the main menu? oh, i mean i cannot click on the drop-down menu with my mouse. i found out that i can click on it if i scroll the mouse but even so cannot scroll to the first drop-down menu. usually we don’t have to scroll but just move the mouse down to the drop-down menu.

this means that if visitors want to access a page on my sub-menu from the drop-down menu, they cannot go directly to it by hovering the mouse on the main menu and click the page link from the drop-down menu. they have to click on the main menu to go to the main menu page and from there only click on the links found on the drop-down menu.

this is no good as for sure we all prefer easy access for visitors – to click on the link from the drop-down menu to go directly to the page. thanks.
my website link:
https://www.ssvp.org.my