I have a few SA (Space Age'rs) and ALL of them do as you describe. They do not 100% bloom "true" if you will. Some seasons I have more blooms with the appendages and others where I have less. The same stalk will have different (possible) displays of exaggerated horns ect than others. Some are more likely to be better at blooming true than other cultivars, reguardless of the circumstances(ie water, fert., Sun, warmth, ect).
I just enjoy them and marvel.
