Please include links to the Numista you are talking about. I searched for “50 Céntimos Caldes de Montbui” and it looks like you are talking about this: N#241241
If the page describes a legitimate banknote (with references Turró# 598 and Gari Mon# 396-D) then you should edit the page and remove the images giving your reference as a source.
(You can save the images and make a new page for the counterfeit.)
If the page doesn't describe a legitimate note, maybe just change the page to describe the counterfeit.
The picture credit is “jerebe”. There isn't a current Numista member with that exact username or I would have tagged the user.