There are three important factors that affect arrow flight:
1. Center shot
2. Bow tune
If your center shot is not set properly your windage (left to right) and elevation (up and down) will be inconsistent. The problem may not be noticeable with field points but will be exacerbated and more obvious when the aerodynamics of a broadhead are introduced.
Bow tune is series of measurements and adjustments made to any compound bow that ensure the bow is functioning properly. Bow tune includes such things as tiller measurement, poundage settings, arrow rest alignment, setting the optimum nocking point location, etc.
Aerodynamics can come into play with a fixed blade broadhead as it is propelled down range. Fixed blade broadheads and the shafts they’re mounted on need to be tuned to ensure there’s no wobble and the shafts spin exactly true. This is important to prevent the broadhead from planing or catching wind currents in such as way as to cause erratic results.
If you’re not comfortable tuning your bow, Parker recommends you visit your local archery shop and have your rig checked out. Not knowing what to do to correct it or how to correct it, can cause even more problems.