There are many causes which can make bud’s blast and I’ve found its usually associated with your own growing environment. Under or over watering, extremes in temperatures can influence developing buds, high light levels can also be a problem so can humidity too dry an air can lead to buds dropping off and of course a poor potting media not allowing the roots to breath being too compacted and finally you may have Botrytis blight you’ll need to research this on the Internet.