What do you mean by the regulator freeflows? Does it do it when you are breathing on it or just when you press the purge button. Regulators are supposed to free flow in the "dive" setting and the airway is unobstructed. They should stop when you put obstruct the air flow, for instance, by putting your finger in the mouthpiece. If it doesn't stop after that then you have a problem.
After being pressurized, and after taking a first breathe.