[Ron Wood]

I am sorry, but I have to disagree, it is normal. Once the striker (firing pin) is set/cocked there is no load on the toggle train. This allows the barrel/receiver group to recoil until the toggle knobs impact the frame ramps. At that point the toggle moves up (just like the manual operation that "Stingray75" performed) and the recoil mainspring is engaged by the rear toggle coupling link. The inertia of the recoiling barrel/receiver group continues the rearward movement until the small extension of the rear toggle link contacts the frame and the lug under the chamber contacts the forward frame well halting all rearward motion of the barrel/receiver group. This allows the mainspring to take over and restore the toggle train to battery.
Ron