I have 9mm Steyr dated 1913. If the slide is racked back and the slide release is pressed, the slide releases, the weapon is cocked but the safety cannot be engaged. If the weapon is racked back, the safety engaged and the slide release pressed, the safety lever can be pushed down releasing the slide and the safety can be reengaged. This is a trigger disconnect safety. Is this supposed to work this way or is there a problem. I intend to shoot this weapon and I want to know all I can about it prior to going to the range. I have never had rounds in the weapon so I don't know if it operates differently loaded. Any information is very welcome.