You must have richer soil where you planted that one. There is no set genetic limit on how big these things will get. If there were it would be called "determinate", and there are tomatoes and squashes like that (well, only c. Pepo squashes AFAIK) but no watermelons as far as I'm aware.
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Yea I have great soil. I get 14 foot tall cherry tomato plants too. Not sure how big my regular tomato plants would get. They tend to break the tomato stakes if they get over 7 feet.