The reason why this happen with the Credit warp glitch, it his because, Mario his also invole into a different abritrary code during the very last step of the glitch, and depending, on when you hit the block that crash the game, that arbitrary code his different, and may still make the Address 0093 JSR:8F,E3= 20,E3,8F work, this his why even if you get the shell in the right X position...