Twin buds on top of 1 branch

I know this is not the best picture ill try to get better ones tomorrow when the lights are on. This is a super silver haze shes 4 weeks into flowering. I topped this plant 1 time when it was about 30 days old (vegging). The 2 main branches stayed pretty equal height up until the last week or so of stretching after the switch. At which point 1 branch stopped stretching and the other stretched another 6 or 7 inches. So as curiosity got the best of me and I inspected every in of the plant I suddenly realized the branch that stopped stretching appears to have 2 tops growing from it. Is this some kind of mutation or is it normal?