It's normal, actually. Even a well integrated flock has "roost time rumbles" and birds will squabble and fight nightly over preferred sleeping spots. As long as there's enough roost space for all the birds (linear ft and if there's multiple roosts, they're far enough apart to prevent picking)...
Most set ups have some bottlenecking somewhere (single pop doors being the most obvious). As long as lower ranked birds have somewhere else they can go most of the time instead of shuffling by in tight quarters, they should be fine.
Hopefully expansion will solve most of the issues!
Yes, and the reason is birds have a personal bubble of around 5-6'. So as you can imagine, if the run is 4' wide, it gives lower ranked birds zero space to get by without the higher ranked bird taking offense. They're initiating a chase simply because they can't squeeze by. This is why a...