Shoes wearing out on the toes??

Brian Boyle

Anyone any suggestions on what causes the soles of my asics gt-1000 to wear as per the photo. They're coming up on 450 miles, but these are the first ones ever to show such an issue. Is it my running gait, or just a duff pair?<img src="https://us.v-cdn.net/6027274/uploads/editor/ba/cszs015n9qah.jpg" alt="">