first thing i can think of is fire/vanilla.....these can be very subtle morphs and maybe one of the parents was a vanilla or fire that went unnoticed.
this could happen if one of the grand parents was a vanilla/fire albino, very hard to ID that one. something like this could have happened: breeder sold a fire/vanilla albino as a regular albino due to ID issue, then next breeder thinks he's breeding a regular albino to a pied, hatches out a fire/vanilla double het albino pied, thinks it as a normal DH albino pied because he's not expecting anything extra...you breed it and notice the odd balls....very complicated explanation with a lot of maybes, but it's more rational and has better odds of happening than triple hets...