Taking an order into the resolution center doesn't automatically result in any changes to your stats but if you propose a refund and it is accepted then that refund will under normal circumstances will be reflected in your refund rate but there are certain situations where that may not happen e.g. a vendor is proven to have been scamming. To answer your other question if the other orders you placed have not been confirmed i.e. are still marked as "processing" and 4 days have passed you can cancel yourself without any effect on your stats.