Hi Svalli,
Mine divided in the first fall as well.
I was cutting them to eat instead of pulling, but when I dug some to transplant last fall I found they had a pretty large bulb under the ground as well. That was after two years in the same place though. Now I'm wondering if I could grow these as a multiplier onion, for the bulbs as well. I guess we need to experiment!
The seeds came to me originally in Nicky's swap several years ago, so I'm not sure who sent them in. But perhaps that person will see your post and tell us more about them.
In the second year mine also flowered around the middle of the summer season. This year the mature ones are flowering quite a bit later, almost as late as leeks which just opened a few days ago.
One more thing about them, I overwintered some in the greenhouse, but still they went completely dormant for at least a few weeks, although temperatures were not that cold but the shorter day length would explain it. Leeks continued to grow in the cold and dark. Amazing creatures.