I'm not a fan of growing mutations that impact the leaves... if growth looks normal, it's probably okay. The other concern is if it's a "self-topping" plant, for lack of a better word, it makes controlling the canopy more difficult.. end up with too many branches, congestion, smaller buds...
if it starts growing normal, looks normal, and doesn't keep popping extra branches per node, it might be fine. I'd kill off the smaller one. That rarely turns out well.. one plant dominates, one plant suffers and is useless. 1 plant - 1 pot, regardless of how it happened.
Is it possible any physical damage occured? (rhetorical) Even a drop of fertilized water could kill a young growth tip, then you'd end up with 2 branches like that... as long as the axillary buds had formed.