Laser problem with cutting straight

[Tsvetomir]

Hello,
I have Co2 laser, with large working area (2,5x1,25m) and I have strange problem.
I need it to cut straight lines but the result is not satisfactory.
I am attaching picture to see what our laser cuts are looking like.
It`s with ruida controller and my x/y axis is software calibrated.
So where could be the problem?
Thank you in advance!

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