Where's my bees?

I'm making a bee farm. I acquired a bees nest and brought it to my desired location where I have a few bee hives I built. Two bees came out of the nest, a baby and an adult. I fed the baby flowers until it grew to an adult. Now there's only one bee. The other seemed to dissappear after the baby one grew into an adult. It's a protected area and the other bee did not die, it just disappeared. I then fully enclosed the area and brought two more bees into the area using a lead. I tied the leads to a fence post and sealed the area again. The bees went into a hive and have not come out. There's still only one bee to be found in my bee farm. Where's the other three bees?