Setting up the C Beam for its first cut, I am having some problems with the positioning of the cutter head. On the software, the zero position is set at 0,0. On the machine I moved the cutter head to a relative 0, 0 position. For my test, I designed a number of knobs extending to a material space of x=300, y = 80. Problem begins when i start the run, the cutter head drifts to a negative value before it starts on the cutting job. Are my directions reversed or is there some other problems with my configuration? I am doing most of the setup using GRBL's firmware settings panel. Thanks.