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This is just one particular case...there maybe more we haven't really looked at, yet. Also, they haven't yet fully explored this planet's orbital history. It maybe this way because it was still quite convective within the body of the planet when it arrived in its present orbit. Which means it's been there since early on. The planet was well mixed early on whilst it was forming, and has stayed that way now, due to its proximity to its parent star.
Every planet has to be taken on a case by case basis. There is most likely a "standard" way of forming these planets, but there is always variations to the standard and not all planets will necessarily follow the standard to the letter (if, in truth, any planet really does).
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