It's nothing bad, man. LoL. Chill, bro.

It's an uncommon occurrence -- the polypoidal complex. With a dichotomous plant such as cannabis it's best explained with the quote and picture below..

"A polyploid is a plant with twice the normal amount of chromosomes in its cells. Cells reproduce by replicating their chromosomes and splitting. As the cell divides, the new chromosomes become the nucleus of the new cell. In a polyploid, the replicated chromosomes do not separate. They remain in the cell causing it to have twice as many as it should. Although polyploids are no more potent than their normal counterparts, they have been found to be larger."

[ I borrowed the picture below from another site. It was the best reference I could come by. ]

My one question is -- did it start out with three sets of leaves from seedling, or did this just happen?