It's a freak! I do love seeing freaky plants Absolutely nothing to be concerned about. The way I see it, you have more to collect the light giving better root coverage and overall growth. Isn't nature nice sometimes.
it is a common mutation... i have seen it 3 or 4 times in my own tents. Enjoy it while it is being strange, soon she will straighten out and one branch will take dominance and the other two will become secondary nodes
I, too had a mystery seed with three tops. After a while, however, two of the branches crowded out the third. But ti looked like a feather duster for the longest time!