Dimensional and positional values just change

Good evening. Lightburn seems to change the positional and dimensional values. For example, I will create a circle 2mm x 2mm. Then I will change the width and height to 1.5mm by 1.5mm. When I finish the values will be 1.5mm and 1.498mm. Same with position. It will sometimes just change. Even after ensuring all the correct values and reentering 2 or three times, the will change later. For example, I will take a 4mm circle, then cut a 1mm hole in the middle. The circle will be 3.994mm wen I’m finished. I would like a way to stop this behavior and for the values to stay as set. Thank you.

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