All of the nests have been used by different hens at different times. Recently Mary was broody in one nest while everyone else used a different one a few metres away.I'm trying to catch up but I'd like to ask do your hens use the differently placed ones? Like a couple or few favorites that are quite separate from each other? This is interesting.
The only time the hens at my place fight over nests is when one is broody and her friends need her to move. The scattered nests fixed that problem, for the time being at least.
They also like it when I refresh the straw in a nest. It seems to remind them of that particular nest, which then becomes someone's new favourite, while the others continue on.
Lately they've been laying in the one nest, but I think that's because the other two nests need fresh straw. No fighting though.