The purple comb is not a good thing and could be heat/electrolyte problem or circulatory problems...keep a particularly close eye on that one. Make sure they have shade mid day and plenty of cool water.
Are these your only two hens? How much room do they have during the day? Should be at least 20 square feet. Perhaps they are confined in too small of a space for too long. That combined with extra stress of new hormones and the desire for a private spot to lay.