Lightburn camera aligment issues

Hi, I’ve installed a 5MP 120° camera on my laser, but I’m having trouble calibrating it properly. After calibration, there’s about a 3mm deviation in various directions. Is this a camera issue, does it need to be perfectly centered over the working area? During the dot test, I placed the card with dots at the extreme positions of the working area, not the camera’s. Could that be causing this problem?

https://a.aliexpress.com/_Ev5A8bd

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