So I have 4 girls, they have all been laying for approximately 5-6 weeks, two started first then the younger 2 a few weeks later, I get 4 eggs most days and on some occasions 3, all the eggs are laid around 10ish,however I have started seeing in the evening 1-2 eggs just randomly in the garden, perfect in every way, except for the fact that the shell is like rubbery and soft, the youngest Polly, did it in front of me the other day, just squatted and plopped it out, anyone else have this and k ow why