My hair does this very same thing. How long is your hair? I've noticed it but I've always thought it was because my natural hair is still very short, about 5 inches long.

Now that you mention it though, I looked at the sole baby pic I have (where my hair isn't brushed to sheep-like status) and the roots are not defined. After an inch or two of something that isn't straight nor curly, it Os all the way down. I just took a pic, does yours look something like that?
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Weird Curls..-20130220_122410a.jpg