ID Vertex Color for Baking

I am using ZBrush and PolyPaint (Vertex Color Information) for furthre use as a Masking ID when baking within Substance Painter. 

Screenshot below shows clean Polypaint (Vertex Color)

When baking inside Substance Painter, I am getting everywhere "Color Bleeding". For example, the rope should be only blue, but green color from the sack is bleeding into it.

• What am I missing here, what am I doing wrong and how to fix that issue?

Thanks for any thoughts, ideas and help,
appreciate it!