Awards - non-crediting of Producers

I produced a short film with two other producers.  It has won several awards on the festival circuit.  Initially, when I submitted the awards for the film, I included the writer/director and the three producers, and we were all credited with the award.  However, recently, when the film won at a festival in London (an award the four of us collected in-person on stage), I submitted the four of us for that award, but only the writer/director was included when the award was posted on IMDb (even though the film that won Best Short included the producer and director at the same festival).  I tried to add us again on 'Edit Page' and then by 'Correct/Delete'.  But we have not been added. And now, this week, the film won a number of awards at the UK Film Awards. Again, I submitted all four of us for the award, but only the writer/director was included.  

It is clearly an intentional action by IMDb to exclude the producers from these awards, and it has only started happening recently.  It's not fair and undermines the role the producers have played in making the film. The film wouldn't exist without us, and we should be included when the film itself wins any award.  Most of these festivals have a Best Director award, where the director can win the award individually.  And of course, when a film wins a Best Picture Oscar, it is the producer(s), who collect the award.  

Have any other producers had had this experience recently?  And can someone at IMDb please explain why you have recently adopted this policy of excluding producers from the awards their films are winning?