If I read you right, that is completely normal operation.
Upon firing, the barrel travels backwards a short distance, locked to the slide (the locking block in the "up" position with its lugs engaged with corresponding slots in the slide).
At the end of its (the barrel) travel (after chamber pressures have dropped to safe levels), the locking block is cammed down by the large pin hitting the abutment on the frame, forcing the lugs downward OUT of engagement with the still rearward traveling slide.
The rearward travel of the barrel is halted, but the slide, having been freed from the barrel, continues to travel rearward, completing the ejection and cocking cycles.
After completing its rearward travel, the slide then continues its cycle of operation and starts traveling forward. Upon contacting the breech face of the barrel assembly, it then forces the barrel forward until the locking block is forcibly cammed upward by a ledge in the frame into engagement with the slide once again, securely locking the barrel to the slide.
I hope you get your new recoil spring guides soon, because we are all anxious to see if that was the problem.