Did you not just post this an hour or two ago? I'm almost certain I ansered this but I can't find it now. You have a retained interior die break. It's a fairly common place to have them on Lincoln Cents. EDIT: You did, and I did. I'm not going crazy. https://www.cointalk.com/threads/2008-lincoln-cent-bad-hair-day.309560/#post-2970592