Hi Mark, The marriage thing seems to be an order of addition thing. If you have the marriage data with a source, most programs that create the gedcom tie the husband and wife and any children associated with them in a linked format as part of gedcom standards. So you get the: Husband Irwin Herbert Cohen. Wife Shirley Frances Quint. Marriage 22 FEB 1951.  Child: Marilyn Eileen (Living) Cohen.
All well and good for Herbert and Shirley in their Profile, but it goes into Marilyn's as well. Not good. For some reason it has to do with the order you added them to WikiTree. If you added Shirley and Herbert before Marilyn, this would not show up in Marilyn's Profile. Add Marilyn before Herbert and Shirley, it shows up in her profile. I have just learned it is a quirk that I watch for when I am Adding a name to WikiTree by GEDCOMpare and delete it in the Edit Text area before I save. But the order in how persons who are related is important for WikiTree to make automatic connections between family members.
Now to the Source: #S16. It points back to Marilyn's Profile. Could you have perhaps created a WikiTree Mobius Loop??? LOL I have rough time giving you an answer as the Privacy level on Marilyn's Profile does not permit me to go into the edit section to see how the Wiki Markup is set so you are getting that result. Have not run across many Reunion imported Profiles yet, so hard to tell if it is a Reunion to WikiTree problem or not. Do you have any other Profiles where this problem has occurred that are set to Open Privacy so I could take a peek.
And welcome Mark to WikiTree. I loved the concept of one Global Tree where we all connect which is why I joined WikiTree. I am a WikiTree GEDCOMpare Mentor, so if I am here to assist with questions about it. As you have probably noticed, WikiTree gedcom file imports are not load and dump. Since WikiTree is a shared environment, more care is taken on Adding names to it. Hence, the GEDCOMpare utility.
While my answer on the marriage mystery is more of a work around than a cure, it does help to keep you on your toes. LOL
All the best Mark and Welcome again,