My Park cable cutters have worked very well for years so I have to assume yours is a fluke and Park appears to be more than willing to fix the problem.

I do find that it, and other cable cutters, work very well on all inner wires and on index-type shift housing. They work less well on spiral-wound brake housing and I prefer a pair of good side cutters and I work the cutting jaws between the coils as I cut. A flat file quickly smooths up any remaining burs.