MAYBE the firmware on the WebServer side (problem present only on Web-UI and APP) reverses the direction of movement of the X and Y axes does not correspond to the actual (and correct) one in Lightburn/LaserGRB.
Have you identified the part of the firmware where you can customize the direction of the axes ONLY for web applications such as Web-UI and APP?
MAYBE the firmware on the WebServer side (problem present only on Web-UI and APP) reverses the direction of movement of the X and Y axes does not correspond to the actual (and correct) one in Lightburn/LaserGRB.
Have you identified the part of the firmware where you can customize the direction of the axes ONLY for web applications such as Web-UI and APP?