I'm not so sure that it's a manifestation of being a young plant; but, the single flower is something typical of a first bloomer. I think the deformity is just a random genetic thing. I've got big, multi-growth besseae-type hybrids that are the picture of health and vigour that produce a flower like that now and then. Remember that our Phrag hybrids are made up of genes from plants that were never meant by mother nature to be mixed together. I think these anomalies are just random genetic mutations brought on by the odd mix of genes from distantly related Phrag species. With this type of breeding, I don't think you're ever going to get away from this totally. Whenever I see a flower like that, I just pull it off and look forward to the next one, which usually is normal.