My grandfather was always telling me stories about bees (he had many bees too).
As I can remember, bees (and mostly the queen) has cannibalism instincts and because of every beehive must and have only one queen, in order to keep this they "kill" the new queen if the old queen is not yet in the year to leave the hive. Furthermore, he had told me that if there is born a new queen, the hive send the new one away and give her few workers to make a new start.