yolk in coop ???

just been to pick up our daily egg that 1 of our 4 girls has been laying for the last 2 weeks, as usual the egg was sat there waiting, but there was also a big bright yellow patch that looked very much like egg yolk, there was no sign what so ever of any shell so what could this be, could it be one of the other girls trying to start laying or an undeveloped egg coming out at the same time, the other egg was purfictly formed and as clean as ever

Not speaking from experience but there have been a lot of similar threads on here. It seems to be a common thing when they first start laying that their shells can be soft, mis-shaped or even missing. It should settle down with time when they get the hang of it.

yes i mix oyster shell and roasted egg shell into there food daily, only got 1 of the 4 laying at the moment(started 20 july), been getting an egg a day except for 2 days she missed out, the eggs have been getting bigger each time and had no soft shells or funny shapes yet, so was wondering if this may be one of the other girls having a go.
by the way the eggs taste great, i finally got one sunday after the kids,wife,2 nephews1 niece and the next door neighbour, and i'm the one who feeds,cleans and care for them and last one to get an egg