Richol,
You started started seedlings on 12/12?
you do understand that seedling are not like clones? Seedlings have a predetermined amount of time before they can go into flowering. For each is different.... but once they start sprouting uneven nodes is when they are ready. If you notice, when they first sprout, all the nodes are even, two right across from each other, but the older the plant gets, it will start sprouting single nodes.

Good looking grow.