It is normal for steam to come from the top of the unit or the valve when building pressure or steaming. It is not normal for a lot of steam to come from the place where the lid meets the pot when closed. If this is happening, the seal is probably inserted incorrectly. Open the lid, run your finger around the seal to make sure that it is tight and evenly attached to the lid. Double-check to make sure that the valve is closed before cooking.