Ad Blockers interfere with displaying Ancestry links.
You're welcome, Harry! Thanks for the star!
I've encountered similar problems with links not displaying on WikiTree web pages while using Adblock Plus (ABP) on Windows/Firefox. When I disable the ad-blocker and refresh the page, the links display correctly. The problem appears to be that ABP is incorrectly blocking non-ad content. In my case, one of the links being blocked pointed to a publicly sharable genealogical record at Ancestry.com: https://www.ancestry.com/sharing/16683697?h=445f05.
IMO, my disabling of ABP for a particular domain is not an adequate fix for the problem. While that does allow me to see the links, it doesn't resolve what I believe to be the root cause of the problem: ABP is incorrectly blocking non-ad content. I've reported the issue to ABP.