Misaligning and changing size mid burn

Recently added the lightburn camera to my yorahome 6550… added camera so i could engrave multiple things in one go instead of stopping and starting everytime…
Well first few no problem.
But now. Mid burn 1 of two things happens. Part of my burn gets misalligned or part gets size changed.
Belts are tight. No loose bolts. No wobble… etc.
If you look at the picturs you can see what its supposed to be vs what im getting. Any suggestion




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