Yes, but sometimes it is a good thing.
Layers mash is a very high protein food, much higher than natural food, and the chickens respond by converting the excess protein into eggs. Battery hens are deliberately overfed to increase production. Reducing the protein will not bother the chickens but they will reduce the egg production.
Sometimes I deliberately reduce the mash by mixing with grain just to reduce the stress of continuous egg laying.
They will come to no harm, and may benefit from it.
John