Welcome
@LindsayDarling
I’m not sure but if they are outside from dawn til dusk, the space cant be the issue. And if they can find food outside , + they can eat from the pellet feed you give them, the food is probably no issue.
So I think a horny young rooster or misbehaviour of some flock members is a real possibility. I would go outside to see what the chickens are doing.
Depends on who you ask and the quality of the feed. Free range chickens is very different from imprisoned chickens, or feeding during winter when there not much food to find.