Turning on $32=1 will fix the burning between cuts.
If doing that turns off the output, it likely means you are asking the machine to move much faster than it has been configured to allow, and it is reducing the power to compensate for that. 3018’s are pre-configured for CNC use, not laser use, so their maximum speed is usually about 8.3mm / sec. If you ask the controller to go 16.6 mm/sec, you’ll get 50% power output in laser mode, because it keeps the ‘deposited power’ to the amount you requested.