Chromakey error multiple cameras

We are using 3 cameras. There are no issues when we shoot without a background. However, when we put up the keyed background/virtual set, the first camera shot bleeds into the new camera shot.

With the first or single camera there is no problem.

Is there a plugin or need to write a macro to enable multi-angle chromakey?

Some have suggested using a separate computer via. sdi or hdmi to generate a multi-angle backgroung (ex using VMix).

Thanks for any responses.

SL

For clarification, we are using the ATEM 1 m/e 4k with 3 BM studio cameras.

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