There is no such thing as the 'bug' where SE is picked more on random. It happened once on en., but they fixed it, and it hasn't happened again. SE is just picked more, because some people think it is lucky.
http://us.grepolismaps.org/ - When players select random location start, they are placed in an area of the map, in this worlds case, it began SE. The area fills to a certain point and then the placement begins to rotate around the map placing players of like starting times together. If you look at all the maps you can see the swirling type of pattern from southeast counterclockwise, this is how the system is placing the random players. Doing this keeps the newer players clumped together and helps to maintain the balance so that new players arent placed right beside someone who has been on for a month. While it is not always possible to do this, the method the system chooses is the best to try to attain that goal. I hope this clarifies.