Destry,
Could be any number of things. Ideally, the bow hand/arm should move SLIGHTLY left on release BUT>>>
Really need to see a video of your shot to see what you are doing. Along with some more information. How long shooting, bow weight, bow type, arrow used (spine, overall weight, etc).
An occasional left MAY be bow arm or MAY be string side arm; just need to see to help much.
Arne