Nothing to worry about. Here is a quote from their website.

"Is there any wear on the vanes or feathers?
Yes. Vanes will show wear after substantial use, some brands more than others. Urethane based vanes seem to be the most durable. After 30 to 50 shots a scalloped wear pattern will appear on the outer 1/8 inch of the die cut edge of feather fletching. This does not affect arrow flight. Nor does it progress beyond the initial wear-in period."

Good groups by the way.