When a WikiTree profile links to Ancestry via either a plain link or a template the WikiTree web site converts it to an affiliate link. This is one way that WikiTree is able to generate some income.
In the last week or so Ancestry changed the partner that they use for affiliate links. They changed from Partnerize to Rakuten. WikiTree had to update for this. Links using Rakuten have linksynergy in the start of the URL.
That is all background. I am not seeing any problems with these new links but it sounds like they are failing for you. Is this still happening? Perhaps you have a blocker installed in your browser that doesn't like them. For example here is a blocker that talks about blocking them.