2 week old chicks trying to fly out of brooder

I’m new to raising baby chicks.
I have a couple 2 week old chicks who are desperately trying to fly out of the brooder they’re in. They’re inside in a 27 gallon tote with all the things they need but just wondering if this is normal? Every time I open the top of the brooder to clean it they’re trying to fly out. When I’m in the room with them they’re trying to fly out even with the top on the brooder, which makes them hit the top of the...

2 week old chicks trying to fly out of brooder