Indeed.It's normal and any given evening I can hear my flock going through the same sounds...flapping, squawking, thumping and bumping as the young birds forget their place on the roosts and the older gals remind them. It's no big deal and no one will wind up dead.
Just as long as you have plenty of space, roosting at different levels so the young birds can actually roost at night without having to get on the same roost as the older birds, they will all settle in just fine. There will always be nighttime squabbles....I don't know that I've ever heard an evening coop that was all quiet and peaceful, no matter the ages, breeds or sex of the birds in the coop.
I call it the Roost Time Rumble...can be rather raucous, even with birds that have lived together for months and months.