Ships with a right handed propellor will, in reality, always swing the bow to starboard when going astern. This is known as "prop walk" and is used by ship handlers to make life easy in many cases. The models in SSE are designed to reflect this situation to make them as realistic as possible. If you are having a problem & if the ship is fitted with a bow thruster then use it to counteract the effect. A vast amount of work is done with the dynamics of the ships in SSE to try to replicate the real thing.
Traddles.