Make sure your not gripping the grip this is called torquing,could be the cause ,I know a few guy's who have told me that they weren't doing this but when I watched them shoot that's exactly what they were doing torguing to the right . Make yourself consious of how you setup to shoot and alway's remember your grip just before you release. Hope this help's.
When I setup I first make sure that I anchor in the same spot every time then I lineup through my peep and then when I'm set to shoot and I know everything else is right I check my grip when thing's are perfect I release. Make sure you follow through with the shot ,Do not try to see where the arrow is going before or even as you release . Release let your bow roll forward while watching your arrow flight .This work's for me ,I'm sure some guy's have different routine's. Try it!

nubo