Ultimatte - Magenta fringe around clothing

Hello,
Using an Ultimatte 12 for a live key. Something I've noticed is magenta coloring on the skin around clothing edges, especially if the talent is wearing purple, pink or red. Occasionally those areas will key out. It does not show up when looking at the Foreground Input, so I don't think it's coming from the camera or lens. It only shows up when looking at the Program or Fill. I've attached an example. You can see the magenta on the skin where the top meets the shoulder.
Any ideas for what this might be or how to fix it?
Thank you.
Using an Ultimatte 12 for a live key. Something I've noticed is magenta coloring on the skin around clothing edges, especially if the talent is wearing purple, pink or red. Occasionally those areas will key out. It does not show up when looking at the Foreground Input, so I don't think it's coming from the camera or lens. It only shows up when looking at the Program or Fill. I've attached an example. You can see the magenta on the skin where the top meets the shoulder.
Any ideas for what this might be or how to fix it?
Thank you.