Cutting outline is slightly off?

I suspect you have a mechanical issue with the laser. Review the tension of your belts, particularly on the Y-axis. If it’s loose, increase tension.

Additionally it may be possible there’s some backlash in the system based on the ends of the cut not meeting. If so, make sure that the pinion gears are properly secured to the stepper shafts. There is normally a set of grub screws used to secure those to the shaft. Make sure that one of them is against the flat of the shaft and the other one well secured. If you do find them loose I’d suggest using some light thread locker to prevent them backing out.