Crawf,
Check your alignment in your address of your feet and where the ball is pointing. Check also that your pushaway and first step are also properly aligned to your reference point on the lane. If all those are aligned properly (and you will need someone watching you to confirm that), then it is probably a timing issue, and not knowing your game, I would not be able to comment, ither than to say check your pushaway and pushaway step (1st for 4 step, 2nd for 5 step) are in cadence, ie: they start together, finish together, are the same length, same speed and same rythm.
Hope this helps