If you manually changed firmware settings, revert them so that they work correctly in UGS.
In LightBurn version 2.0, we changed the way talk to CNC machines like your xCarve, which, unlike a laser, don’t always report 0,0 as the coordinates after homing.
Jon gave a more in-depth explanation here:
This Release Candidate for the upcoming version 2.0.02 addressed an issue that this change has introduced for machines that home in the negative space.
Additional changes in your Device Settings might be needed in your case, and the questions from @bLouChip are relevant!