Ok, I'm a little confused... I'm playing solo with a basic nitrogen map. Day 1, by the time I get to the trader, I've got irradiated zombie cops and giants. I've restarted 3 times and every time, within 10 minutes of me arriving at the trader on Day 1, the trader is utterly swarmed, massive sections of wall exploding, numerous zombies swarming in. Is that normal?