Hello and welcome to BYC, You found an Amazing Poultry Community to be a part of with many great knowledgeable members, who are more then willing to jump in and help you along your journey with any questions you may have.
Welcome to BYC, @DobieLover is right. Chickens get bored and cranky. Additional waters, feeders,roosts, and hiding places help keep the peace.
Try attaching pallets against the side of the run, putting in some stumps or ladders to roost on. It is especially important to have more than one feeder and waterer, as some will try to guard them.
Best of luck with your flock.
I agree to put in some clutter so places to hide from bullies. It says you let them out every other day? Is that a typo?. But hey welcome to a lot of chicken wisdom here.