What is going on with these eggs?

[s1a2b3]

We have four Easter Eggers. Year and 3 months old. Two of them lay green eggs, the other two lay blue. Over the last month, the blue layers have been laying eggs with major calcium deposits. However, I keep finding completely smashed blue eggs in the nesting box as well as Death Star blue eggs(dented). About 90% of the calcium eggs float in water. Their behavior is normal. Does anyone have any ideas of what might be causing this and how to help our girls get back to normal?

I had this problem for a little while, I would suggest feeding the two different breeds seperatly.

 

[Appenzeller friend]

@Eggcessive, @azygous @Wyorp Rock @coach723
Educators. What do you guys make of this? Have you ever seen anything like this before in multiple hens in a flock?

yes, I am seeing a very similar thing for the past 3 months. Feeding Naturewise Hearty Hen, soy free 18% protein. I have fed this for 3 years and added crushed, dried egg shells. However 2 hens are exhibiting the same problem with extremely thin shells. If they are not crushed when the lay them they crush when I touch them. Chickens are in their 3rd year and 4th year -one is an ISA BROWN and one a Bielefelder.