Sometimes people have different lifestyles, may be they have to move to another city, may be they are changing jobs, may be thay have some dificulties etc. it is hard to know and guess. I had clients that they had to sell their home less than a year due to job change. Unfortunately I am not from the area that I cannot send you the stats about this area but contacting with the listing agent might be helpful for you. Do not think about the worse before learning the right reasons of selling from the listing agent.