Hi, Zana --
Finding an egg covered only by the membrane inside the shell (but not the shell itself) happens from time to time. I grew up on a poultry farm, and found such eggs occasionally.
As I recall, the best way to deal with this situation is to be sure that the hens have enough calcium in their diet. A common way to assure sufficient calcium is to feed the chickens oyster shell. This supplements the calcium found in most commerical chicken feeds. Commercial poultrymen feed it "free choice"; that is, they make it available in a feeder other than the one in which the basic chicken feed is offered. I have chosen to add about 1/2 cup a day to the commercial chicken feed for my 40 hens; this seems to work well. Oyster shell is usually available at most farm and ranch supply stores.
I hope this helps. Best of luck...
Rick
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