"Ring" around a lot of my eggs?!

[WhitneyG]

Hello So, lately I've been noticing quite a few of my eggs have had "rings" around them. Like there's this one section of the egg that goes all the way around, that's fatter than the rest of the egg... does that make sense? Anyways, I was wondering if it's something wrong with their feed, or if they're cooped up or what (it's not just one hen's egg)
Thanks in advance

 

[Kelsie2290]

http://www.thepoultrysite.com/publications/1/egg-quality-handbook/20/bodychecked-eggs/ Wonder if you are getting a lot of what they call "body-checked" eggs?