One on the left is a dwarf form, which looks as though it did not have a leader for some years. A leader popping out to the side of a bush shape is also seen rather often on commonly sold Pinus strobus 'Nana' (preference given to P. strobus f. nana by Jacobson, 1996) which may then go on to produce a comparatively slender small tree over many years.
I've seen this on a Picea asperata at Rich's Foxwillow Pines as well. It could be a seedling with dare I say, bad genes. Kinda like me. And I mean BAD to the bone! Dax