I used to do this, although ever so slightly. Just concentrate on keeping your shoulders level. I used to notice it the most when mounting rails cause would always fall back on my left thigh. Just keep the shoulders level or even throw up the left one a tad.
yeah, i do that too on an off day....but just concentrate on making the spin really fluid and level....watch how you wind up, and how you throw the spin...and how your body position is in the spin....look forward not down, dont wind up too hard, etc.