The most probable reason can be tyres. Generally right hand cars r heavier on the right side as most of the cars have steering system, exhaust, and battery on the right side and most of the time cars r driven by a single person, which means the car constantly is heavier on the right side. This means that there is more load towards the right side and the tyres on the right side worns out more quickly compared to left tyres. Replacing the tyres should resolve the problem. Tyres generally should be replaced at 70,000km or 3 years which ever comes first. Plz check ur tyres. Changing tyres will resolve the problem.