MultiGeometry fill anomally

[Warren-Whitfield]

Hi All
Anybody have any idea as to why the fill issue happens as show in the screenshot. It is the compass rose causing it. The compass rose consists of various LineStrings in a MultiGeometry object. In the code I am setting the style to:-
m_Style.getOrCreate()->outline() = true; in addition, the fill color I'm using is completely transparent as well.
(Color(Color::Aqua, 0.0))

[Warren-Whitfield]

Just as an update, I think I've resolved the issue. It seems rendering at the same altitude causes this.