The secondary leaves will come, all cannabis plants start out with just the one set of round shaped leaves and no others. Some take longer to grow their first set of true leaves.
One things for sure and that is your light is way too far away, which is why the stems are so long and lanky.
I did and it made a difference. I had to build a little hut for them but they are strong for the most part, but those two little ones look deformed to me.