Adam,
Your bees were keeping the queens locked in their queen cell while prepping for swarming, probably multiple swarms. A new queen added to the hive would have been accepted in this situation. Put your ear to the hive and listen for queens piping. If you hear them, you still have multiple queens and they are going to swarm again. If you hear piping, get or make a bunch of queen cages and slowly take the hive apart with minimum disturbance. You can have 10 or more queens in that hive.
Jim