Z offset changes in middle of job

I am doing a project. z-offset is set at 27.4. one layer. as the laser is cutting it changes back to 0 in the middle of the project. any ideas?
![IMG_0631|375x500](upload



://qSMQcw9h5IIDl5lqz8M75fnVNJ8.jpeg)

Is your machine Z axis correctly setup? Read the Lightburn document please:

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I think so. I did email the company, but everything was working until I received a replacement machine. I didn’t change any settings from the old to the new machine.

It´s a CO2 perhaps with a GRBL controller…
Do you have a copy of the original machine?
Did you setup your machine as GRBL or Ruida?
If GRBL type $$ in LightBurn console window and post here the output.


Gbrl

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