I have 4 Rhode Island Red Layers. 1 or 2 of them recently began laying these odd shaped eggs. I avoid selling these eggs as I thought they appeared unusual. Someone suggested they are the result of being multi-yoked. I thought overfeeding may have been the reason. Can chickens be overfed a particular brand/type of feeding? They were reared from chicks with Southern Grain products & I recently switched to Faithway products and I wondered if that maybe the difference. Is switching from one brand to another a good idea? Otherwise they appear healthy.