I would keep growing it. Having all those shoots or nodes are a good thing as the plant will be nice and bushy with lots of tops. I personally found autos flowers don't like training as they grow so fast and the best mindset to have with them is to just prevent as much shock. I wouldn't say this is a mutation and it is what I look for in my plants. Lots of shoots or nodes. I currently have a Guava dog I started from seed indoors and put outdoors to flower. It looked similar to yours when I put it outside and without any training, it is now filling up a 3X5 greenhouse and the plant is over 6 ft! Good luck!