Answer: Is it possible that some of the "buds" you thought were coming along were actually seed pods forming where the old blooms had been? I ask this because each flower only lasts a day, and the pods look very similar to buds at first, but then do turn brown and dry up much as you described. This would also fit the profile for Stella d'Oro because it blooms heavily in June and then rests before it reblooms in another flush about a month or so later. (This cycle repeats through the rest of the season.) To prevent that dried up look, it is a good idea to either deadhead the blooms daily or to remove the scapes at the base as their last flowers bloom.
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