This problem is present on both PC and mobile – if that will help.
Two of the sites where I turned Sticky Menu off and where bookmarks are not working (no problems when turned on):
And two sites where I turned Sticky Menu on and bookmarks functioning fine. Bookmark menu links also fail to function when I turn Sticky Menu off:
I would prefer to turn Sticky Menu off because of obligations for banners to appear at top of pages – fewer issues with spacing on mobile where breaks in the header to move banners below header create blank space above all content.