I agree with mobow, your bow is out of tune and you maybe underspined/overspined as well. Head to the proshop and also pick yourself up a good bow square and learn how to check these things on your own incase you run into problems in the field. They are pretty simple to use and relativly easy to learn how to make sure everything is square and in tune. I bought one a couple years ago andI tell you, it has saved me a little cash. I think most will agree on having a bow square on hand. They are pretty cheap. Get the NAP kit with the square, knocking pliers and knock points. But i really dont think its your arrows. What weight arrows are you using and what poundage are you drawing? Also what weight head are you using.