Bro, most likely this is a problem with high temperatures at the tops of the buds. Maybe your temperature indicator is set lower or in the shade of the plant or not in direct light, and that's why it's showing 27 degrees, while at the tops it could actually be 29 degrees or higher. Terpenes at that temperature just evaporate faster than new ones are produced - the solution is to direct airflow at the tops, raise the lamp, ensure a fresh air intake, somehow reduce the temperature on the flowering branches. Good luck, bro!