Hey there! Most of the time, that happens due to weather conditions. Try lowering the humidity in the environment, providing good light and a heat source (the heat should come from "the lights," meaning from above). If you're using LED, I managed heat with ceramic bulbs and it helped me. Also, a good use of ventilation would be ideal! The flower opens up so that mold and other fungi don't affect it completely; it's trying to save itself!