When using chroma key, the picture get less sharp/focused. How come?

Using chroma key to erase the green background in a studio, i experience that  the foreground / people/furniture is not so sharp any more, it looks out of focus.  Why is tis? Des is has to to with Wirecast (7.4.0) or is it light or what?

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  • I'd need more details. Camera and input device? 
    Have you tried adjusting Key threshold and Black and White clip?
    Perhaps include a screenshot of before and after so we can see what's happening.

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