2d - Some of my grease pencil strokes are grey while others are

I have a Blender file that is producing some strange Grease Pencil lines. On frame 177 my strokes turn gray, and you can really see it since I have a little color behind the head. The strokes aren't

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2d - Some of my grease pencil strokes are grey while others are black? - Blender Stack Exchange

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