5mp-camera issues

So I went through lens calibration and it’s okay…a little distortion on the edges but it’s alright. Then I did camera alignment and if engrave in the bottum half of the laser bed the alignment is nearly spot on when I do update overlay. For some reason top half of my laser bed is off on the y axis some.

So heres the problem: I’ll have it spot on in alignment on the bottum half of the bed but I’ll leave it for a few minutes and try again and the cut will have shifted down below what I drew. It does this every time after leaving it for a minute. Really frustrating. I have a board propping up the lid where the camera is mounted so it’s always in the same place. What could be going on?

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