The problem is weird.
If you are using a third party widget, I would highly suggest you to avoid it and using the native menu widget.
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It must has to do with your state of your menu items when "active".
Could you provide just one page with exact this issue? Just the menu and maybe some placeholder layers?
Maybe we need just a second page with the same menu, of course.
Did you place the menu on a master?
As I have inspected the code of the site, it somehow misplacing the active link + its getting a css (visibility: hiddden;)