Pouncys eye looks strange

I have a question is it normal for one eyelid to be outlined in black (looks like eyeliner) and the eye not?

Thanks I didnt know if it was a deformity or what LOL Im paranoid something is gonna happen to him. Hes the best coonie I have ever
had in my life. I have had 4 and he definetly takes the top! Imma worry wart :(