Carrot seedlings

Hi there

I am trying to grow my first carrots in a container. After seeding almost 3 weeks ago I e noticed that the lower part of carrot stems seem rather brown. I'm not sure if this is normal or maybe I've done something wrong. Can anyone confirm?

See attached picture.

 

Dont think I would be bothered by that, as long as they continue to grow.

 

Thanks both

 

I've not grows carrots before, mine are nearly 3 weeks old, mine appear to be sprouting and look like yours!