You might want to look at a this good article by the departed BYC member Sumi at many of the odd shaped eggs and possible causes.
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/
I don’t know, but aI have seen that wrinkling on the yolk before. Here is a true egg within an egg:
https://www.cbc.ca/news/canada/british-columbia/eggception-egg-1.4574362#:~:text=The answer is a process,in the process of developing...