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I think I've seen that before when the taxi route X-Plane expected me to take was kind of silly. I think I turned onto the runway before it expected me too (cut off the turn too soon).
You can check what route ATC expects if you have DataRefEditor. You can try setting the art control atc/debug/routing to 1 and reloading the airport. Colored lines will show up for what the ATC expects you to fly.
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