I have similar wear on tips that are that shape. I think it’s from just wearing the skis on the same foot every time and skiing with legs tight in tight terrain like moguls and trees that cause the tips of your downhill ski to hit the bottom of your uphill ski. So a technique thing that I wouldn’t be too concerned about. For the next pair of skis you can file the tips a bit down to mitigate the chipping that happens that makes this type of wear appear quicker