Problem - CO2 machine skews to the right when engraving

[snopa]

Hello,
I have problem with CO2 laser machine size 130x90cm when i want engraving it. all the time gently moves to the right.
I think the problem may also occur when cutting, but it is more noticeable when engraving due to the many repetitions of Y-axis motion.
In the pictures you can see what I mean.

For now, I only corrected the tension of the Y-axis belt, it did not improve the work.
Can i correct this on controller RDC6442G ? Or where i shroud search to solve this problem?

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