Personally, I think it's a normal phenomenon, possibly because you added too much water. The pressure cooker has been working to heat up the chicken while stewing, and because the steam pressure inside the cooker is greater than outside the cooker, a lot of internal water vapor is discharged. Or you choose too high a temperature when stewing chicken, so that the pressure cooker working time is higher than the chicken ripening time, that is, after the chicken is ripe and still continue to heat, resulting in the steam has been generated and discharged. It is recommended to add the appropriate amount of water according to the amount of chicken stewed, and select the appropriate temperature and time according to the instructions, when the time is up, unplug the power, let the pressure cooker cool naturally, the exhaust will gradually stop. I hope it can help you.