It can happen.... sometimes a thing called whorled phylotaxy happens too, where instead of splicing into 2 colas the main stem is kind of flat and grows an abnormal cola.
They might be completely different things, but your double cola stem might look a bit weird before the second cola branches out?
It’s not that common... (not for me at least). But I e had it happen once or twice. I have a pic of it in my karma tester thread of karmas OG x biker kush ...