Cutting size problems

Good Evening to All
I drew a 3 squares 1 of 10mm 1 of 20mm and 1 of 30mm, the machine cutted squres of 25, 50 and 75mm can anyone HELP ME.

Hardware : Sculpfun S9
sorfware : lightburn

Most likely, your steps/mm setting is incorrect. Provide more information:

What info is needed???

did same experience with other gbrl software, result same, how do i chenge step/mm?

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