It's possible that when it was just starting to split there was some damage at the apex that caused some of the branches to split again. I've heard of this being done with pinching on pot plants and they call it 'supercropping'. Maybe a couple searches might turn up better information for you, I personally have never seen this done with peppers. It might not work well if at all and I'd be worried about damaging the plant. It is also possible that this is a genetic thing cause ive had plants branch 3 or 4 times by themselves.