Attempting to remove light blue outline from Coast Outline

So I've had CC3+ for a while now, but I'm finally having time to work on it. However, I realized there's a bit of an issue that bothers me. When making the coast around my continents or islands, the coast has this light blue outline that appears. How do I get rid of this or at least make a coast line that looks nice? I've tried to look at tutorials and the Tome of Ultimate Mapping, but I'm still lost.

I've attached a picture to illustrate the effect.

Thanks guys for all the help!

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