Hello Neal,
I have had the same happen but from different members.
I use the GEDCOMpare process and it often has potential matches which are not expected such as matching someone in England with someone in Australia.
In order to complete the GEDCOMpare process you have to discard these rather dubious matches, often you get 10 or more matches for a single person.
So at the end of a typical GEDCOM you may have as many as 200 possible matches that you have discarded.
Quite often about a week or so afterwards i get messages saying that a 'potential' discarded match has been agreed by another wikitree member.
When this first happened about 10 months ago i wrote to the member saying that i had never put forward the 'potential match' pointing out that it was quite obvious that the two people were not the same.
I think i only got a reply once, but not explaining the reason for their message.
I am assuming that somewhere in a 'help' page or maybe a youtube video this course of action has been put forward 'as something to do'.