It looks like it could be pox, but there can be different strains of pox, like all viruses. Also, there could have been a failure in the vaccine, or maybe not given correctly. Did you vaccinate them yourself? Would it be possible that they are pecking each other or injuring themselves on something sharp? The lesions all seem to be around their beaks, but I don't see the usual pox on the combs.
Dont think they are pecking each other, or something sharp but will change where they live next week just to make sure, I did vaccinated them personally. Would it be good to vaccinate them again?
While most of the pictures are of "dry pox", the first one shows "wet pox", and how wet pox tend to affect the mouth, and eye areas more than the comb area. Dry pox, on the other hand, tend to affect the comb more.