Clearly there is something serously wrong. Any chance you can send pictures of the nozzle and electrode you used?
Have you verified that the machine speed is accurate? You can program a straight line 50" long, put the machine in test and set the speed to 50 inches per minute, see if it takes exactly a minute to go 50".
Is your plasma in the cut mode? There is a switch on the front panel that must be in the correct position.
Can you connect the plasma work cable (ground clamp) directly to the piece being cut, does it cut better?
Can you shut the height control off, set the torch (with a new nozzle and shield) at a fixed height of 1/16", and try cutting.....does this work?
Do you have access to a clamp on DC ammeter?
Jim