I don't see that as a big deal, start up inertia should align the props when you take off.
I'm not sure of the physics, maybe the low noise props sit more loosely and do this when they spool down. I have however, watched a comparison video, between the Pro and Pro Platinum. What was established is that the low noise props were, along with the revised ESC's, more efficient and even when fitted to a Pro, they increased the flight time by a minute - as well as being noticeably quieter.
I personally wouldn't worry about this.