Hi I have been lurking here for a while and have learned a bunch as I am new to chickens but now have an issue. we have 6 RIR hen that have been laying for about 8 weeks and have been giving mostly 6 eggs a day some times 5 day before yesterday got 7 eggs one had paper shell yesterday 6 normal eggs today 6 normal eggs . Then went to put them to bed for the night one hen was already on the root and low and behold a 7th egg again paper shell with a tube on one end it looks like particlly bloown up balloon. Is this normal ? we give free choice oyster shell any info will be appreciated than you.