This is the coop …?I hope you can see it . 2 coop parts together are big enough. Thank you , we will have to remove the diving wall agree might be too small
Without exact measurements I'm going to assume this coop is suitable for 2, maybe 3 hens, and you have 5. Crowding is a big contributor to pecking order/bullying issues.
The coop (the upper portion) by itself (minus nest boxes) should be around 20 sq ft. It's also lacking sufficient ventilation, which when combined with cold weather is a contributing factor to frostbite.
This won't be feasible now, but something to possibly consider in the future to expand the usable coop space. It does require that you add a much larger run and/or free range the majority of the day:
To turn it from 2 small "boxes" (tiny coop above tiny run) into 1 bigger "box" you'll want to remove as much of the inside coop wall as possible, plus the floor. Take out the old roosts too.
Nests might be able to stay as is, or may need to be relocated elsewhere or replaced - depends on the structure of the coop and how things inside stack up once done.
Run a new roost(s) lengthwise or widthwise across the newly open space, depending on how much roost is needed. Ideally you’d like 12” per bird but 10” can suffice in many cases.
Board up some of the external wire walls so that the roost area is protected from winds and rain. Do NOT fully cover up all the wire, you need ventilation and natural light, so at the very least a few inches under the roofline should remain open. If your climate allows for it, you can leave entire walls open with just the mesh, or make it convertible for the season by covering up open walls for winter, and then uncovering for summer.
Example of a modified prefab:
https://www.backyardchickens.com/threads/my-renovated-prefab-coop.1440258/