HDMI Port 1 green cast?

Device: Atem Mini Pro
The HDMI input 1 shows an image with an extreme green cast,
Camera used Canon HF G25

Hi Andreas. Can't offer any help, other than to let you know that you're not alone. I had the same problem, though my camera appeared green on both inputs 1 and 2. It looked fine on all other inputs.
Because that was just one of SEVERAL problems, I determined that my device was defective and returned it. Awaiting the replacement device...and praying.

It's green and purple right.. Then it's in RGB mode instead of YUV. Use a different port.. This can't be fixed by the user.

Just put a different source on input 1 that does a proper YUV output..