Accuracy problems

Hello and happy holidays to my CNC family I have purchased this X-carve 1000 a few months back and the One problem I am having and haven’t found an answer to yet whenever I do a union it does not matter the size of the union for the star at the bottom left is smaller (which is the right size) than a star at the top right and you can see the stars getting a little bit bigger and maybe small amount but I could see it even with my bad eyes.

If anybody has any suggestions that would be helpful thank you

I suspect that the surface of your material has varying height.
Possibly thickness variation or warped.
Another possibility is that your waste board is not parallel to the xy plane of the machine.

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