I don't think it is normal behavior. Bees getting rid of deformed bees, as @Dawn_SD said would be normal behavior.
If you have shaken bees onto the ground before taking frames of honey, sometimes young bees wont be able to fly back. If that happens, you can place a stick from the ground to the entrance for the bees to walk up.
If they don't make it back into the hive, do the right thing & give them a decent burial.