So I've set up on SharePoint 2013 Managed Metadata Navigation for a site collection, inherits to all sites below. When I access as a "Site Member" or "Site Owner" I get to see the full navigation. When I access as a "Site Visitor" aka read only access, I get only a few selected sites on the navigation, where I can't seem to figure out the difference between the sites I can see and the sites I can't see. Permissions state at the site level that "Site Visitors" get read access to the entire site collection (basically "Domain Users" is a member of the "Site Visitors Group"). However when I temporarily bumped "Domain Users" up to "Members" I could see everything as just a domain user.
Any ideas on what could be the cause? Thanks!