1987 Error Lincoln penny

I'VE LOOKED AT THIS 1987 LINCOLN CENT 100 TIMES I CAN'T FIGURE OUT HOW THIS FOLDOVER ERROR COULD HAVE HAPPENED ?YOU TAKE A LOOK AT THE PHOTOS AND SEE IF YOU CAN TELL. WITH A THE NEW EQUIPMENT UPDATES HAPPENING AT THE MINT YOU WON'T SEE TO MANY MORE OF THIS TYPE OF AN ERROR.