No, its not typical of Bees Sunset - I can't think what might cause this but for one thing - shortage of water as the flower spikes form and grow and start opening. The plant, if short of water, may not bother to form the flowers at the tip properly, or will sacrifice them after they've formed. The other possibility is nutrition related - they do like a good topdressing of composted manure, and certainly they do respond well to this, because it increases the soil fertility and makes it more moisture retentive.