Air sac on the side of incubated egg

[Danbenj]

Hi I'm incubating some eggs which have been fertilised by our rooster. I have candled the eggs and we are on day 13. In one of the eggs the air sac is on the side of the egg and not in the top pointy end. Is this going to be a problem for the growing chick and hatching?. The chick is growing and moving at the moment. I will attach a picture of the candled egg.
Thanks for any help

 

[Silkiebegins]

I'm not really experienced with that but I think it is a detached air cell.

 

[Danbenj]

I'm not really experienced with that but I think it is a detached air cell.

Thanks for replying. The air cell looks stable and is not moving also the egg is on day 15 and the chick is moving. Any advice as to how to help the egg hatch appreciated. Thanks