Answered
Why do I get black center in my lines?
I get suddently black center in my lines. Also if I eyedropp on a green
line that has no black center. 
I get suddently black center in my lines. Also if I eyedropp on a green
line that has no black center. 
yes. No fill there.
Its not fill. Its second stroke above, In appearance panel Menu Click "Reduce to Basic Appearance" or delete overlapped stroke.
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