I recently had a seedling from a cross I made (lvtk x tangerine power) that did this same thing.
It started out a twisted leaf mutant but then shoot out normal looking leaves until the 3 node and then it stalled out. Topped itself basically so I cut that top off so the bottom nodes would grow. Here he/she is now.
Sorry I thought I had a pic of the whole plant but it is just a close up.