Brush Issue

[Burpee]

This is the second thime I've encountered this problem and hope someone can figure it out.

I made a picture with different layers, then created a brush. The gree 3 leaf is what I used to create the brush with. When I go to use the brush, it's all gray.

If I start a new drawing, the color is fine and the brush works as intended. Any suggestions?

(I deleted all the layers of the original drawing and just attached the brushes as they look from within the drawing. Even with the layers gone they are still grayed out.