This may be because a lot of storms start at tropical latitudes because this is where the ocean is. They will then move towards where the wind will take them which is usually the western side. This makes certain areas more prone to getting storms as compared to others. The storm has the tendency to go towards the place where the warm air is.
In the process, the low-pressure area may become stronger and become a full-blown typhoon. At times, the low-pressure area will slowly go away and no typhoon will form. It will depend on the wind and the temperature of the path that the typhoon is traversing.