I believe that is generally the way it goes with a second blooming in the season. The flowers are a bit smaller since the plant has not stored up enough energy for another big show. I bet they will be large and symmetrical next season after a bit of a rest. Do you cut the spikes off on your phals or do you allow them to rebloom on the same spikes?
BTW, I think they are all lovely. My favorite is the classic white one though.