Wrinkled eggs

[grammaC]

My RIR and SLW chickens are 36 weeks old and one of them keeps laying these small, wrinkled, deformed eggs. When I crack them open, everything appears to be fine. The girls have oyster shell available, and are given layer feed. They have scratch grain out in the run, or on the floor of the coop when it's raining or snowing.

Should I be worried?

 

[ChickensAreSweet]

http://edis.ifas.ufl.edu/ps020
here is a link with charts at bottom

 

[Den in Penn]

Here is a link to possible causes. http://www.thepoultrysite.com/publications/1/egg-quality-handbook/18/misshapen-eggs There is another page on that site that talks about the flat sides.

 

[jester8484]

i get these also but not consistently. maybe once a month. not sure what her deal is and honestly im not sure which one is laying it.