Strange. Don't think I've ever seen that before. I can see how they might mess up the EDT and EDP, but not at significantly different prices.
As you say, there's only one GIT. I don't know why Fragrancenet makes the mistakes they make. They also group Creed fragrances into "men's" and "women's," which is often completely incorrect.
I'd just choose whichever one is cheapest and go with it. Don't forget to use a discount code.