Ok try checking your stepper drive and make a note of the micro stepping settings. If your drives are set to 16,000 steps per rev then reducing to 8,000 will double the travel of the x-axis. There should be some dip switches that will allow you to change the settings, make a note of the current settings so you can revert back.

Also do both the 'step length' settings match in the software for the x and y.