Hmmm, I don’t think that’s the case. I do the mob rub down. It was more like when there’s a rock stuck in your shoe. It ripped the grans of grip right off leaving streaks of smooth black. I really wanted to like the laces but… yeah
thats weird. never heard of that happening before. well, if its still functional and grips then it might just be a cosmetic thing. better than having to switch out laces after every session.
try putting them in the washer with your clothes, maybe that'll get some of whatever its coated with off of it and would make it snag less.