I put some NAP Quick Fletch Quick Spin ST arrow vanes onto my girlfriends arrows. She is shooting a Browning Micro Eclipse. After shooting the bow, I noticed that in the same spot on every arrow, there is a black rub mark on one of the vanes. What is that telling me? did I put them on wrong or is the bow out of tune somehow? I had the guy at bass pro make sure everything was in tune. I don't know what is going on.