It is hard to tell from the pictures....but it appears that the nozzle is dammaged at the orifice. Make sure that the selector switch on the front panel of your 1650 is in the cut position....you do not want it in the gouge or the continuous pilot position.....either one of these other modes will cause this type of damage to the nozzle.
Ensure that you are not piercing too close to the plate. Your pierce height should be set at 1.5 to 2 times the recomended cut height.....and the pierce delay time should be set just long enough to allow full penetration of the plate before machine motion starts. If pierce delay is too short...material blowback can cause nozzle damage as shown in the photos.
On 10 mm plate I would recomend using the 60 Amp consumables for best cut quality....the speed will be slower but the edge quality and the edge squareness will be far superior. Always match the power to the material thickness for best quality....the 100 amp process is generally used for thicker material or when cut speed is more important than quality on thinner sections.
Best regards, Jim colt