Why is Flight 815 flying over the island in LA X?

This came up on another blog, I think it merits some discussion.

In the OT, flight 815 was "a thousand miles off-course" when it hits turbulence and crashes on the island. In the FST, the plane is presumably on-course since it lands as scheduled in LA. Yet somehow, the flight still hits turbulence and passes directly over the (sunken) island. Is this a major goof, or does it mean that in the FST, the island is in a different location (other than the bottom of the ocean, of course)?

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