How to get the stroke's color same goes with the fill's

So i've run into some similar questions but still can't find the right answer.

I made a circle in Adobe Illustrator and stroke it with artistic brush but it turn out like that. I've tried to copy the fill's color code and paste it - didn't work. Saved the fill's color to color swatch and choose it to color the stroke - didn't work either.

Can anybody help me i'm so desperate :'D

ps: pardon my english.