I'm sorry you are having problems with your grow, however, this could be very helpful for you, if you learn what happened. Those are fairly small buds to have mold or bud rot, however, that is what it is. You have a watering issue and the plants are showing you something is wrong in your watering management. How are you watering? What water type are you using and how often? Indoor or outdoor? What type of soil and nutrients? Any information would be helpful. Thank you for sharing your work friend.
Make the plant ask for water.plants are in 2 gal cloth pots (only half full), Fox Farm Ocean Forest medium - nothing else. Hand water every day 1/2 qt - 1qt each with tap water.