World randomlyn switches

The realm switches between 2 world randomly. 1 player can randomly get into another world when 2 people are already online and if they log out and in we all get into the "new" world and then after a while the same thing happens but we get to the other "old" world instead. When this happened we only had 1 world. Also when it "switched" world some users got stuck on connecting until we restarted the realm.