Camera losing calibration

Machine: k40 with a nano

Board:Cohesion 3d laserboard

Firmware: “I have a new board and I’m using whatever it came with”

Problem/ Question: After calibrating a hd webcam for use it is instantly shifting compared with the update overlay view. I am obtaining excellent results with the dotted paper and then centering exactly on the targets, instantly the calibration is out (by the same amount roughly every time!
My webcam is in a fixed position directly above my laser, my laser is screwed in position to a solid bench so neither item moves! Can anyone suggest a fix!

Perhaps this might be a better question for the LightBurn Support Forum?

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