Ok, this may or may not be a bug but I have a gut feeling that it is. So far in my world all but the first night and one other night there has been a blood moon, the second non-blood moon night wasnt a blood moon because it was the Eye of Cthulu Boss spawn event. Also, for the third day in a row the goblin army has spawned and it is very annoying trying to build some NPC houses and having to fight hoards of enemies at the same time. The only reasonable answer I can think to have a small chance to happen again and again repeatedly is there must be something wrong in the game codes. Thank you.