Hello, the ideal time to transplant peppers is between 21 and 25 days after transplanting, when the seedlings have reached a height of 12 centimeters and have 5 leaves. If they're left in these trays for a month, they'll likely flower sooner. Another factor is water stress, as germination trays don't retain water or humidity for long. However, if, through some carelessness, they begin to flower in the tray, simply transplant them and remove the first flower, and that's it. Although I see you've already done this, I wish you the best with your growing. Best regards.