Oven Element Shot - But Won't Shut Off

I USED MY OVEN YESTERDAY AND IT WORKED FINE. AFTER USING IT, I TURNED IT OFF AND WENT ON MY MERRY WAY. LATER LAST EVENING I WENT BY THE OVEN AND FELT HEAT FROM IT, AND WHEN I OPENED THE DOOR THE OVEN WAS HOT. THE ELEMENT ON THE BOTTOM WAS GLOWING IN TWO SPOTS (APPARENTLY CRACKED), BUT THE OVEN WAS SHUT OFF!!! I HAD TO TURN OFF THE BREAKER TO SHUT IT DOWN. AFTER IT COOLED, I SEPERATED THE CRACKED ELEMENT AND TURNED THE BREAKER BACK ON FIGURING WITH A BREAK IN THE CIRCUIT, IT WOULD NO LONGER HEAT. WRONG!!! WHEN I OPENED THE OVEN DOOR TO CHECK IT, THERE WAS STILL A SPOT GLOWING ON THE ELEMENT. ???
I HAVE ORDERED A NEW ELEMENT FOR THE OVEN, BUT AM WONDERING WHY IT WAS STILL HEATING AFTER THE OVEN KNOB WAS TURNED TO OFF??
ANYONE HELP???