Hi. I need your help pls. When i cut with speed under 50 then my machine cut two lines on one axis. Above 50 speed are no issues, engraving also no problems. Power for test are 30%. I have checked mirrors and lens, they are fine. Pelts and pulleys also ok. I have no idea what i can check at next
https://youtu.be/9aTXd7cDkis