Odd egg

[aworldintime]

Ok so I keep finding this kinda egg from 1 hen. Everyone looks good. I have 1 who decided to malt during winter lol. I have been giving them scratch. Some days they are almost perfict other days look like this. Any ideas?

 

[Bluechick2u]

I've had one like that from my hen a few times before, so I'm hoping somebody has an answer as I've been wondering too!