I have a minimal number of links in my nav menu. The yellow underlines (scroll spy maybe?) are always active for on-page jump-to links (root/#anchor_label). I only have two pages, so the link to the Contact page is the only one that doesn’t display in an ‘active’ state. I would expect that they’d be only active if a) someone accessed that part of the page via the nav menu, or b) if this is using scroll-spy then the links would show active state when the page is scrolled to that region.