I regularly find articles with completely incorrect isbn3 in templates Ouvrage inserted by VE on frwiki that don't seem related to the actual book. It's always isbn3, not isbn, isbn2 or other parameter of the template. Examples of fixing the article: Musée René Magritte, 7 arts (revue d'avant-garde), but there were many other.

I've struggled to reproduce it several times, and finally found a user that gave me enough information to reproduce it.

• Edit Musée Réné Magritte on frwiki with VE
• Click on the "Sourcer" button
• Type "jacques roisin magritte biographie" and click on the "Générer" button
• 2 sources are suggested, and the second one is the citation with the problem :

<ref>{{Ouvrage|nom1=Roisin, Jacques.|titre=Ceci n'est pas une biographie de Magritte : la première vie de l'homme au chapeau melon|éditeur=Alice Éditions|date=1998|isbn=2-930182-05-9|isbn2=978-2-930182-05-6|isbn3=2002420539|oclc=43991516|lire en ligne=http://worldcat.org/oclc/43991516|consulté le=2020-04-04}}</ref>

There are 3 ISBN in the citation proposed by VE, the third one being completely incorrect. And I don't know from where it comes : if you look at Worldcat for the OCLC of the citation, only the 2 correct ISBN are visible, there's no mention of the third incorrect one. Where did the citation tool find this third ISBN?

I checked through the API also with the same request jacques roisin magritte biographie, and see the same problem in the JSON result:

[
  {
    "itemType":"journalArticle",
    ....,
    "source":["Crossref"]
  },
  {
    "itemType":"book",
    "title":"Ceci n'est pas une biographie de Magritte : la première vie de l'homme au chapeau melon",
    "url":"http://worldcat.org/oclc/43991516",
    "ISBN":["2-930182-05-9","978-2-930182-05-6","2002420539"],
    "oclc":"43991516",
    "date":"1998",
    "publisher":"Alice Éditions",
    "author":[["","Roisin, Jacques."]],
    "accessDate":"2020-04-06",
    "source":["WorldCat"]
  }
]

In the result I see that the source is WorldCat, but when I check the WorldCat URL, I can only see the first 2 ISBN, and there's nowhere a 3rd ISBN... Where does Citoid find this 3rd ISBN, which is completely incorrect?