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I think that they've just updated how the color appears on the website. Our blue X changed color on our MyTesla page and in the car in 2016 without a change to the Deep Sea Blue paint.
Ha! You sound like my wife who said the same thing when I decided to autoflex my car (see my avatar). This color is becoming very popular now and we saw a BMW and a Mercedes back to back driving the other day with it. I happen to love the color and feel like I got a new car for $2700