Random cutting and 3mm unexplained movement

Hi there, i am a lightburn user and have 100w bodor C02 laser.
I have file created in illustrator with both engrave and cut sections
Even with optimise turn on, and using the preveiw video window, the output seems very random and NOT what i would call systematic at all. It jumps randomly to different sections.
Also when i sent this job to the laser it seemed to engrave and cut fine until 3/4 the way through the job and then randomly moved everything over 3mm???

any hints?

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