Axis deflecting while jogging in G54

Hello everyone,

I’m experiencing some odd behavior when jogging in the G54 coordinate system. When I jog from X0 Y0 to X100 Y0, the Y-axis deflects slightly, as if a small rotation or compensation is being applied. The final reported position is X100 Y0.084. The Z-axis is not affected. A similar issue occurs in the opposite direction: when I jog along the Y-axis, the X-axis also deflects. However, if I issue an MDI command to move to X100, the Y-axis remains unchanged, which is the expected behavior. When I switch to G55 or G56, everything works as intended—there is no coupling or linkage between the X and Y axes. I’ve attached a screenshot showing the issue: first I moved from X0 to X100 using an MDI command, then manually jogged back. You can clearly see the Y-axis deflection during the jog. I have already cleared all work coordinate systems, but the problem persists specifically with G54.

Any help would be greatly appreciated.
Greetings,
Sandro