The pet shop that I work at bought 10 gouldian babies a few days ago. One of those has something strange going on with its beak. I call it Shoebill, since I think the deformity resembles the beak of a shoebill. The color is also quite off compared to the others, but I'm not sure whether this could be related to its head color, which might be yellow (looks black to me, but apparently the breeder told my colleague they were all going to be red or yellow heads)? There is one more with the same beak color and no deformity - its beak doesn't look as smooth as the others' though.
Googling beak deformities didn't turn up anything quite like his beak so I'm hoping someone on here can tell me what's going on.
My main theories right now are malnutrition or parasites. Google mentioned polyoma virus causing overgrown beaks and whereas I didn't notice this when looking at the bird I do think the beak looks slightly overgrown in the pictures.
Please let me know what you think:


Not the best pictures but the birds didn't particularly like having my camera in their cage so I hope you can make something of them.