X axis is shorter when lasered

Boss laser with Ruida 36x55 150w.
3"x3" file burns as 2.75x3. Flat bed. Not using rotary. Why is this happening. I don’t remember changing any setting from one day to the next this started.

Check to see if the rotary indicator is lit up:

It’s remarkably easy to enable the rotary by accident, as many folks have discovered.

If that’s not it, a screenshot of your LightBurn window and the offending lbrn2 file will let us see what you see.

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