Cold nights after hot lamp hours are an underrated reason feminized plants throw the odd pollen sac. A sharp gap between day and night temperature reads as a threat to the plant, even if each reading looks acceptable on its own. The risk control notes at https://queenfeminizedseeds.com name rapid temperature swings directly and give 21 to 25 degrees as the working range across all stages. Running the lights at night in summer, or a small heater on a thermostat in winter, flattens the curve cheaply.