I started playing the latest version of Dwarf Fortress yesterday. The first two migration waves carried two and four dwarves respectively. Then suddenly, when the third wave arrived, my fortress was flooded by immigrants to a total of 75 dwarves. I've never seen such a big immigration before. Was there a recent change in how immigration works? What could have caused this?
The only things I've done between the waves is fairly normal stuff: digging straight downwards without finding anything, mining out some hematite, butcher some animals, trade small amounts with the caravan, and dig a lava moat out of the volcano.