Sub Menus will not work

The problem is your sub menus are hidden behind your header wrapper because the overflow is set to hidden.

enter image description here

So a quick fix would be to go to Admin > Appearance > Customize > Additional CSS and paste in the following CSS. This will allow the overflow content to be visible.

.header-cover {
    overflow-y: visible;
}

Note: I have no idea what you changed to cause this or if this has any adverse effects to your site so be sure to test it out.

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