I've noticed that when I go to disassemble my Glock 26 for cleaning, the recoil spring & spring guide rod assembly are not seated in that curved "seat" on the Lug under the barrel. It is always out of the "seat" and moved up from it just a bit. Is this normal? Does the recoil spring assembly normally move out of the "seat" during recoil? Is there anybody here that can clue me in?